TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Pastor, Ferenc
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4346
AB  - Isopiestic measurements have been made at 55 compositions of the {yK(2)HPO(4) + (1 - y)KH2PO4}(aq) system at T = (298.15 +/- 0.01) K, 11 for each of the limiting binary solutions and 33 for mixture compositions at K2HPO4 stoichiometric ionic strength fractions y = (0.23330, 0.47671, and 0.73177), using KCl(aq) as the reference standard. Model parameters for the binary subsystems were evaluated at this temperature for an extended form of Pitzer's ion-interaction model and also for the Clegg, Pitzer and Brimblecombe model based on the mole-fraction-composition scale, using the present isopiestic results along with critically-assessed osmotic coefficients for both of these aqueous electrolytes as extracted from the published literature. The thermodynamic models for KH2PO4(aq) extend to slightly above the saturated solution molality at T = (298.15 +/- 0.01) K, whereas those for K2HPO4(aq) extend to m = 9.7429 mol.kg(-1), which is the molality of the saturated solution, also at T = (298.15 +/- 0.01) K. These results yield the CODATA-compatible standard Gibbs energy of formation Delta(f)G(m)(o)(K2HPO4 center dot 3H(2)O; cr; 298.15 K) = -(2367.70 +/- 1.60) kJ.mol(-1). The 33 osmotic coefficients for the ternary mixtures were likewise represented with these models, using both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms for the extended ion-interaction model. Two mixing parameters are needed for each of the three models for {yK(2)HPO(4) + (1 - y)KH2PO4}(aq), and both of these ion-interaction models give similar high-quality representations of the experimental results. However, the Clegg, Pitzer and Brimblecombe model had more difficulty in representing the osmotic coefficients of K2HPO4(aq), especially below 3 mol.kg(-1), and consequently the corresponding mixture model with two mixing parameters is slightly less accurate for representing the osmotic coefficients. The maximum difference in calculated values of the mean molality-based activity coefficients for the two recommended extended Pitzer models with the different types of mixing terms are 0.0061 for the trace activity coefficient of K2HPO4(aq) in KH2PO4(aq) but with much better agreement at most mixture compositions.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K
VL  - 142
DO  - 10.1016/j.jct.2019.105945
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Pastor, Ferenc",
year = "2020",
abstract = "Isopiestic measurements have been made at 55 compositions of the {yK(2)HPO(4) + (1 - y)KH2PO4}(aq) system at T = (298.15 +/- 0.01) K, 11 for each of the limiting binary solutions and 33 for mixture compositions at K2HPO4 stoichiometric ionic strength fractions y = (0.23330, 0.47671, and 0.73177), using KCl(aq) as the reference standard. Model parameters for the binary subsystems were evaluated at this temperature for an extended form of Pitzer's ion-interaction model and also for the Clegg, Pitzer and Brimblecombe model based on the mole-fraction-composition scale, using the present isopiestic results along with critically-assessed osmotic coefficients for both of these aqueous electrolytes as extracted from the published literature. The thermodynamic models for KH2PO4(aq) extend to slightly above the saturated solution molality at T = (298.15 +/- 0.01) K, whereas those for K2HPO4(aq) extend to m = 9.7429 mol.kg(-1), which is the molality of the saturated solution, also at T = (298.15 +/- 0.01) K. These results yield the CODATA-compatible standard Gibbs energy of formation Delta(f)G(m)(o)(K2HPO4 center dot 3H(2)O; cr; 298.15 K) = -(2367.70 +/- 1.60) kJ.mol(-1). The 33 osmotic coefficients for the ternary mixtures were likewise represented with these models, using both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms for the extended ion-interaction model. Two mixing parameters are needed for each of the three models for {yK(2)HPO(4) + (1 - y)KH2PO4}(aq), and both of these ion-interaction models give similar high-quality representations of the experimental results. However, the Clegg, Pitzer and Brimblecombe model had more difficulty in representing the osmotic coefficients of K2HPO4(aq), especially below 3 mol.kg(-1), and consequently the corresponding mixture model with two mixing parameters is slightly less accurate for representing the osmotic coefficients. The maximum difference in calculated values of the mean molality-based activity coefficients for the two recommended extended Pitzer models with the different types of mixing terms are 0.0061 for the trace activity coefficient of K2HPO4(aq) in KH2PO4(aq) but with much better agreement at most mixture compositions.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K",
volume = "142",
doi = "10.1016/j.jct.2019.105945"
}

Ivanović, T., Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Pastor, F.. (2020). Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 142.
https://doi.org/10.1016/j.jct.2019.105945

Ivanović T, Popović D, Miladinović J, Rard JA, Miladinović ZP, Pastor F. Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K. in Journal of Chemical Thermodynamics. 2020;142.
doi:10.1016/j.jct.2019.105945 .

Ivanović, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Pastor, Ferenc, "Isopiestic determination of the osmotic and activity coefficients of {yK(2)HPO(4) + (1-y)KH2PO4}(aq) at T=298.15 K" in Journal of Chemical Thermodynamics, 142 (2020),
https://doi.org/10.1016/j.jct.2019.105945 . .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Pastor, Ferenc
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4562
AB  - Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4and Na2HPO4at T = 298.15 ± 0.01 K, at NaH2PO4ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4as 1:1 and Na2HPO4as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol·kg-1, whereas those for Na2HPO4(aq) extend to m = 2.6050 mol·kg-1, which is well above the solubility limit for the thermodynamically stable phase Na2HPO4·12H2O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH2PO4+ (1 - y)Na2HPO4}(aq) mixtures was found in the literature [ Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183 ], and hence an analysis and comparison were made of our results with theirs.
PB  - Amer Chemical Soc, Washington
T2  - Journal of Chemical and Engineering Data
T1  - Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K
EP  - 5153
IS  - 11
SP  - 5137
VL  - 65
DO  - 10.1021/acs.jced.0c00281
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Pastor, Ferenc",
year = "2020",
abstract = "Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4and Na2HPO4at T = 298.15 ± 0.01 K, at NaH2PO4ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4as 1:1 and Na2HPO4as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol·kg-1, whereas those for Na2HPO4(aq) extend to m = 2.6050 mol·kg-1, which is well above the solubility limit for the thermodynamically stable phase Na2HPO4·12H2O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH2PO4+ (1 - y)Na2HPO4}(aq) mixtures was found in the literature [ Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183 ], and hence an analysis and comparison were made of our results with theirs.",
publisher = "Amer Chemical Soc, Washington",
journal = "Journal of Chemical and Engineering Data",
title = "Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K",
pages = "5153-5137",
number = "11",
volume = "65",
doi = "10.1021/acs.jced.0c00281"
}

Ivanović, T., Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Pastor, F.. (2020). Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K. in Journal of Chemical and Engineering Data
Amer Chemical Soc, Washington., 65(11), 5137-5153.
https://doi.org/10.1021/acs.jced.0c00281

Ivanović T, Popović D, Miladinović J, Rard JA, Miladinović ZP, Pastor F. Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K. in Journal of Chemical and Engineering Data. 2020;65(11):5137-5153.
doi:10.1021/acs.jced.0c00281 .

Ivanović, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Pastor, Ferenc, "Isopiestic Determination of Osmotic and Activity Coefficients of the { yNaH2PO4+ (1 - Y)Na2HPO4}(aq) System at T = 298.15 K" in Journal of Chemical and Engineering Data, 65, no. 11 (2020):5137-5153,
https://doi.org/10.1021/acs.jced.0c00281 . .

TY  - JOUR
AU  - Ivanovic, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinovic, Zoran P.
AU  - Pastor, Ferenc T.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4748
AB  - Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4 and Na2HPO4 at T = 298.15 +/- 0.01 K, at NaH2PO4 ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4 as 1:1 and Na2HPO4 as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol.kg(-1), whereas those for Na2HPO4(aq) extend to m = 2.6050 mol.kg(-1), which is well above the solubility limit for the thermodynamically stable phase Na2HPO4 center dot 12H(2)O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH(2)PO(4) + (1 - y)Na2HPO4}(aq) mixtures was found in the literature [Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183], and hence an analysis and comparison were made of our results with theirs.
T2  - Journal of Chemical and Engineering Data
T1  - Isopiestic Determination of Osmotic and Activity Coefficients of the {yNaH(2)PO(4) + (1-y)Na2HPO4}(aq) System at T=298.15 K
EP  - 5153
IS  - 11
SP  - 5137
VL  - 65
DO  - 10.1021/acs.jced.0c00281
ER  - 

@article{
author = "Ivanovic, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinovic, Zoran P. and Pastor, Ferenc T.",
year = "2020",
abstract = "Isopiestic measurements have been made for aqueous solutions of the common sodium cation mixtures of NaH2PO4 and Na2HPO4 at T = 298.15 +/- 0.01 K, at NaH2PO4 ionic strength fractions y = (0, 0.24851, 0.49862, 0.74544, and 1), where the ionic strength fractions were calculated by assuming complete electrolytic dissociation of NaH2PO4 as 1:1 and Na2HPO4 as 2:1 electrolytes; CaCl2(aq) was used as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T = 298.15 K for both NaH2PO4(aq) and Na2HPO4(aq) using the isopiestic results from this study (17 values each) together with numerous critically assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for NaH2PO4(aq) extend to m = 7.5 mol.kg(-1), whereas those for Na2HPO4(aq) extend to m = 2.6050 mol.kg(-1), which is well above the solubility limit for the thermodynamically stable phase Na2HPO4 center dot 12H(2)O(cr). The 51 osmotic coefficients for the ternary mixtures were treated with these two models together with Scatchard's neutral-electrolyte model; one previous set of osmotic coefficient values for {yNaH(2)PO(4) + (1 - y)Na2HPO4}(aq) mixtures was found in the literature [Scharge, T.; et al. J. Chem. Thermodyn. 2015, 80, 172-183], and hence an analysis and comparison were made of our results with theirs.",
journal = "Journal of Chemical and Engineering Data",
title = "Isopiestic Determination of Osmotic and Activity Coefficients of the {yNaH(2)PO(4) + (1-y)Na2HPO4}(aq) System at T=298.15 K",
pages = "5153-5137",
number = "11",
volume = "65",
doi = "10.1021/acs.jced.0c00281"
}

Ivanovic, T., Popović, D., Miladinović, J., Rard, J. A., Miladinovic, Z. P.,& Pastor, F. T.. (2020). Isopiestic Determination of Osmotic and Activity Coefficients of the {yNaH(2)PO(4) + (1-y)Na2HPO4}(aq) System at T=298.15 K. in Journal of Chemical and Engineering Data, 65(11), 5137-5153.
https://doi.org/10.1021/acs.jced.0c00281

Ivanovic T, Popović D, Miladinović J, Rard JA, Miladinovic ZP, Pastor FT. Isopiestic Determination of Osmotic and Activity Coefficients of the {yNaH(2)PO(4) + (1-y)Na2HPO4}(aq) System at T=298.15 K. in Journal of Chemical and Engineering Data. 2020;65(11):5137-5153.
doi:10.1021/acs.jced.0c00281 .

Ivanovic, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinovic, Zoran P., Pastor, Ferenc T., "Isopiestic Determination of Osmotic and Activity Coefficients of the {yNaH(2)PO(4) + (1-y)Na2HPO4}(aq) System at T=298.15 K" in Journal of Chemical and Engineering Data, 65, no. 11 (2020):5137-5153,
https://doi.org/10.1021/acs.jced.0c00281 . .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Belošević, Svetlana
AU  - Trivunac, Katarina
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4174
AB  - Isopiestic measurements have been made for aqueous mixtures of NaH2PO4 and KH2PO4 at T=(298.15 +/- 0.01) K, at NaH2PO4 ionic strength fractions y=(0, 0.19108, 0.38306, 0.58192, and 1), assuming that both electrolytes dissociate as 1:1 electrolytes, using KCl(aq) as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T=298.15K for NaH2PO4(aq) using the present isopiestic results (13 values), as were those for KH2PO4(aq) using the present isopiestic results (12 values), together with numerous critically-assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for KH2PO4(aq) extend to m=2.187molkg(-1), which is slightly above saturation, while those for NaH2PO4(aq) extend to m=7.5molkg(-1), which is below saturation. The 39 osmotic coefficients for the ternary mixtures from the present study along with 42 values from a published study were likewise represented with these models, with both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms being used for the extended ion-interaction model. Two mixing parameters were needed for each of the models, and all three models gave similar quality representations of the experimental results. Maximum differences in calculated values of mean molality-based activity coefficients for these three models are (+/-)(NaH2PO4)0.0080 and (+/-)(KH2PO4)0.0043. The experimental results were also found to nearly conform to Zdanovskii's rule.
PB  - Springer/Plenum Publishers, New York
T2  - Journal of Solution Chemistry
T1  - Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNaH(2)PO(4)+(1-y)KH2PO4}(aq) System at T=298.15K
EP  - 328
IS  - 3
SP  - 296
VL  - 48
DO  - 10.1007/s10953-018-0839-4
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Belošević, Svetlana and Trivunac, Katarina",
year = "2019",
abstract = "Isopiestic measurements have been made for aqueous mixtures of NaH2PO4 and KH2PO4 at T=(298.15 +/- 0.01) K, at NaH2PO4 ionic strength fractions y=(0, 0.19108, 0.38306, 0.58192, and 1), assuming that both electrolytes dissociate as 1:1 electrolytes, using KCl(aq) as the reference standard solution. Model parameters for an extended form of Pitzer's ion-interaction model and also for the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale were evaluated at T=298.15K for NaH2PO4(aq) using the present isopiestic results (13 values), as were those for KH2PO4(aq) using the present isopiestic results (12 values), together with numerous critically-assessed osmotic coefficients for both electrolytes taken from the published literature. The thermodynamic models for KH2PO4(aq) extend to m=2.187molkg(-1), which is slightly above saturation, while those for NaH2PO4(aq) extend to m=7.5molkg(-1), which is below saturation. The 39 osmotic coefficients for the ternary mixtures from the present study along with 42 values from a published study were likewise represented with these models, with both the usual Pitzer mixing terms and also Scatchard's neutral-electrolyte model mixing terms being used for the extended ion-interaction model. Two mixing parameters were needed for each of the models, and all three models gave similar quality representations of the experimental results. Maximum differences in calculated values of mean molality-based activity coefficients for these three models are (+/-)(NaH2PO4)0.0080 and (+/-)(KH2PO4)0.0043. The experimental results were also found to nearly conform to Zdanovskii's rule.",
publisher = "Springer/Plenum Publishers, New York",
journal = "Journal of Solution Chemistry",
title = "Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNaH(2)PO(4)+(1-y)KH2PO4}(aq) System at T=298.15K",
pages = "328-296",
number = "3",
volume = "48",
doi = "10.1007/s10953-018-0839-4"
}

Ivanović, T., Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P., Belošević, S.,& Trivunac, K.. (2019). Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNaH(2)PO(4)+(1-y)KH2PO4}(aq) System at T=298.15K. in Journal of Solution Chemistry
Springer/Plenum Publishers, New York., 48(3), 296-328.
https://doi.org/10.1007/s10953-018-0839-4

Ivanović T, Popović D, Miladinović J, Rard JA, Miladinović ZP, Belošević S, Trivunac K. Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNaH(2)PO(4)+(1-y)KH2PO4}(aq) System at T=298.15K. in Journal of Solution Chemistry. 2019;48(3):296-328.
doi:10.1007/s10953-018-0839-4 .

Ivanović, Tijana, Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Belošević, Svetlana, Trivunac, Katarina, "Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNaH(2)PO(4)+(1-y)KH2PO4}(aq) System at T=298.15K" in Journal of Solution Chemistry, 48, no. 3 (2019):296-328,
https://doi.org/10.1007/s10953-018-0839-4 . .

TY  - JOUR
AU  - Ivanović, Tijana
AU  - Popović, Daniela
AU  - Rard, Joseph A.
AU  - Grujić, Snežana
AU  - Miladinović, Zoran P.
AU  - Miladinović, Jelena
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3587
AB  - Isopiestic (vapor pressure) measurements were made for aqueous mixtures of Mg(NO3)(2) and MgSO4 at T = (298.15 +/- 0.01) K with Mg(NO3)(2) ionic strength fractions y = (0.19691, 0.42542, 0.60113, 0.79583, and 1), along with a separate series of measurements for MgSO4(aq), y = 0, all using KCl(aq) as the reference standard. The resulting 44 molality-based osmotic coefficients for the ternary mixtures, ionic strength range I-m = (2.5924-8.4583) mol-kg(-1), were modeled with an extended form of Pitzer's ion interaction model, both with the usual Pitzer mixing terms and also with Scatchard's neutral electrolyte model mixing terms, and also with the Clegg-Pitzer-Brimblecombe model based on the mole-fraction-composition scale. The molality-based osmotic coefficients phi of these mixtures at each fixed ionic strength fraction fall in a regular order between those of the corresponding limiting binary solutions with no crossovers in this ionic strength range. Model parameters for Mg(NO3)(2)(aq) and MgSO4(aq) at T = 298.15 K needed for these calculations were evaluated by using the present isopiestic results along with other sets of reliable osmotic coefficients gleaned from the published literature. Our osmotic coefficients for the ternary system are compared with those from a previous isopiestic study and a hygrometric study and the present results were judged to be more accurate. For this ternary system, both mixing parameters are needed for the extended Pitzer model with Pitzer mixing terms {standard uncertainty of fit u(phi)= 7.0 x 10(-3)} whereas three parameters gave a significantly better fit when the Scatchard mixing terms are used {standard uncertainty of fit u(phi) = 4.0 x 10(-3); the fits with two Scatchard mixing parameters did slightly better than the fit with both Pitzer mixing terms}, as did the Clegg-Pitzer-Brimblecombe model with three mixing parameters {standard uncertainty of fit u(phi) = 5.9 x 10(-3)}, with use of the three Scatchard mixing parameters giving the most precise representation of the experimental results. Including higher-order electrostatic mixing terms did not improve the representations but had the opposite effect.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of the {yMg(NO3)(2) + (1-y)MgSO4}(aq) system at T=298.15 K
EP  - 103
SP  - 91
VL  - 113
DO  - 10.1016/j.jct.2017.05.006
ER  - 

@article{
author = "Ivanović, Tijana and Popović, Daniela and Rard, Joseph A. and Grujić, Snežana and Miladinović, Zoran P. and Miladinović, Jelena",
year = "2017",
abstract = "Isopiestic (vapor pressure) measurements were made for aqueous mixtures of Mg(NO3)(2) and MgSO4 at T = (298.15 +/- 0.01) K with Mg(NO3)(2) ionic strength fractions y = (0.19691, 0.42542, 0.60113, 0.79583, and 1), along with a separate series of measurements for MgSO4(aq), y = 0, all using KCl(aq) as the reference standard. The resulting 44 molality-based osmotic coefficients for the ternary mixtures, ionic strength range I-m = (2.5924-8.4583) mol-kg(-1), were modeled with an extended form of Pitzer's ion interaction model, both with the usual Pitzer mixing terms and also with Scatchard's neutral electrolyte model mixing terms, and also with the Clegg-Pitzer-Brimblecombe model based on the mole-fraction-composition scale. The molality-based osmotic coefficients phi of these mixtures at each fixed ionic strength fraction fall in a regular order between those of the corresponding limiting binary solutions with no crossovers in this ionic strength range. Model parameters for Mg(NO3)(2)(aq) and MgSO4(aq) at T = 298.15 K needed for these calculations were evaluated by using the present isopiestic results along with other sets of reliable osmotic coefficients gleaned from the published literature. Our osmotic coefficients for the ternary system are compared with those from a previous isopiestic study and a hygrometric study and the present results were judged to be more accurate. For this ternary system, both mixing parameters are needed for the extended Pitzer model with Pitzer mixing terms {standard uncertainty of fit u(phi)= 7.0 x 10(-3)} whereas three parameters gave a significantly better fit when the Scatchard mixing terms are used {standard uncertainty of fit u(phi) = 4.0 x 10(-3); the fits with two Scatchard mixing parameters did slightly better than the fit with both Pitzer mixing terms}, as did the Clegg-Pitzer-Brimblecombe model with three mixing parameters {standard uncertainty of fit u(phi) = 5.9 x 10(-3)}, with use of the three Scatchard mixing parameters giving the most precise representation of the experimental results. Including higher-order electrostatic mixing terms did not improve the representations but had the opposite effect.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of the {yMg(NO3)(2) + (1-y)MgSO4}(aq) system at T=298.15 K",
pages = "103-91",
volume = "113",
doi = "10.1016/j.jct.2017.05.006"
}

Ivanović, T., Popović, D., Rard, J. A., Grujić, S., Miladinović, Z. P.,& Miladinović, J.. (2017). Isopiestic determination of the osmotic and activity coefficients of the {yMg(NO3)(2) + (1-y)MgSO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 113, 91-103.
https://doi.org/10.1016/j.jct.2017.05.006

Ivanović T, Popović D, Rard JA, Grujić S, Miladinović ZP, Miladinović J. Isopiestic determination of the osmotic and activity coefficients of the {yMg(NO3)(2) + (1-y)MgSO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics. 2017;113:91-103.
doi:10.1016/j.jct.2017.05.006 .

Ivanović, Tijana, Popović, Daniela, Rard, Joseph A., Grujić, Snežana, Miladinović, Zoran P., Miladinović, Jelena, "Isopiestic determination of the osmotic and activity coefficients of the {yMg(NO3)(2) + (1-y)MgSO4}(aq) system at T=298.15 K" in Journal of Chemical Thermodynamics, 113 (2017):91-103,
https://doi.org/10.1016/j.jct.2017.05.006 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Grujić, Snežana
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3362
AB  - Isopiestic measurements have been made for aqueous mixtures of Na2HPO4 and K2HPO4 at T = (298.15 +/- 0.01) K, at Na2HPO4 ionic strength fractions y = (0.2023, 0.4060, 0.6027, 0.8007, and 1), using KCl(aq) as the reference standard solution. The resulting 48 molality-based osmotic coefficients for the ternary mixtures were modeled with an extended form of Pitzer's ion-interaction model, with the usual Pitzer mixing terms and also with Scatchard's neutral-electrolyte model mixing terms, along with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. Model parameters for Na2HPO4(aq) at T = 298.15 K were also evaluated using the present isopiestic results (12 values) along with three other sets of osmotic coefficients from isopiestic measurements taken from the published literature, and all four sets of osmotic coefficients are in good agreement; model parameters for K2HPO4(aq) are already available from our earlier work: (PopoviAc et al. in J Solution Chem 40:907-920, 2011). For this ternary system, only one mixing parameter is needed for each of the three models because the ionic strength dependences of the osmotic coefficients of Na2HPO4(aq) and K2HPO4(aq) are very similar, as expected from their very similar chemistry, with the two variants of the extended Pitzer model giving slightly better representations of the experimental results than the Clegg-Pitzer-Brimblecombe model. Maximum differences in calculated values of mean molality-based activity coefficients for these three models are a dagger gamma (+/-)(Na2HPO4) aecurrency sign0.004 and a dagger gamma (+/-)(K2HPO4) aecurrency sign0.008 for ionic strengths I (m) aecurrency sign 2.0 mol center dot kg(-1), with the largest differences occurring for the trace and near-trace activity coefficients of one solute in a solution of the other solute at higher ionic strengths and solutions rich in K2HPO4 at intermediate ionic strengths. These new results complement our earlier investigations of aqueous common-cation mixtures of K2HPO4 with KCl, KBr, KNO3 and K2SO4.
PB  - Springer/Plenum Publishers, New York
T2  - Journal of Solution Chemistry
T1  - Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNa(2)HPO(4) + (1-y)K2HPO4}(aq) System at T=298.15 K
EP  - 1287
IS  - 9
SP  - 1261
VL  - 45
DO  - 10.1007/s10953-015-0429-7
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Grujić, Snežana",
year = "2016",
abstract = "Isopiestic measurements have been made for aqueous mixtures of Na2HPO4 and K2HPO4 at T = (298.15 +/- 0.01) K, at Na2HPO4 ionic strength fractions y = (0.2023, 0.4060, 0.6027, 0.8007, and 1), using KCl(aq) as the reference standard solution. The resulting 48 molality-based osmotic coefficients for the ternary mixtures were modeled with an extended form of Pitzer's ion-interaction model, with the usual Pitzer mixing terms and also with Scatchard's neutral-electrolyte model mixing terms, along with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. Model parameters for Na2HPO4(aq) at T = 298.15 K were also evaluated using the present isopiestic results (12 values) along with three other sets of osmotic coefficients from isopiestic measurements taken from the published literature, and all four sets of osmotic coefficients are in good agreement; model parameters for K2HPO4(aq) are already available from our earlier work: (PopoviAc et al. in J Solution Chem 40:907-920, 2011). For this ternary system, only one mixing parameter is needed for each of the three models because the ionic strength dependences of the osmotic coefficients of Na2HPO4(aq) and K2HPO4(aq) are very similar, as expected from their very similar chemistry, with the two variants of the extended Pitzer model giving slightly better representations of the experimental results than the Clegg-Pitzer-Brimblecombe model. Maximum differences in calculated values of mean molality-based activity coefficients for these three models are a dagger gamma (+/-)(Na2HPO4) aecurrency sign0.004 and a dagger gamma (+/-)(K2HPO4) aecurrency sign0.008 for ionic strengths I (m) aecurrency sign 2.0 mol center dot kg(-1), with the largest differences occurring for the trace and near-trace activity coefficients of one solute in a solution of the other solute at higher ionic strengths and solutions rich in K2HPO4 at intermediate ionic strengths. These new results complement our earlier investigations of aqueous common-cation mixtures of K2HPO4 with KCl, KBr, KNO3 and K2SO4.",
publisher = "Springer/Plenum Publishers, New York",
journal = "Journal of Solution Chemistry",
title = "Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNa(2)HPO(4) + (1-y)K2HPO4}(aq) System at T=298.15 K",
pages = "1287-1261",
number = "9",
volume = "45",
doi = "10.1007/s10953-015-0429-7"
}

Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Grujić, S.. (2016). Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNa(2)HPO(4) + (1-y)K2HPO4}(aq) System at T=298.15 K. in Journal of Solution Chemistry
Springer/Plenum Publishers, New York., 45(9), 1261-1287.
https://doi.org/10.1007/s10953-015-0429-7

Popović D, Miladinović J, Rard JA, Miladinović ZP, Grujić S. Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNa(2)HPO(4) + (1-y)K2HPO4}(aq) System at T=298.15 K. in Journal of Solution Chemistry. 2016;45(9):1261-1287.
doi:10.1007/s10953-015-0429-7 .

Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Grujić, Snežana, "Isopiestic Determination of the Osmotic and Activity Coefficients of the {yNa(2)HPO(4) + (1-y)K2HPO4}(aq) System at T=298.15 K" in Journal of Solution Chemistry, 45, no. 9 (2016):1261-1287,
https://doi.org/10.1007/s10953-015-0429-7 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Rard, Joseph A.
AU  - Miladinović, Zoran P.
AU  - Grujić, Snežana
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2726
AB  - The molality-based osmotic coefficients of aqueous mixtures of K2SO4 and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic method, at K2SO4 ionic strength fractions y = (0.21008, 0.39887, 0.60657, 0.80517, and 1) over the ionic strength range (1.3167 to 1.9587) mol . kg(-1), using KCl(aq) as the reference standard solution. These osmotic coefficients were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte solution mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. Model parameters for K2SO4(aq) at T = 298.15 K were also evaluated using the present results along with seven sets of osmotic coefficients taken from the published literature. For the {yK(2)SO(4) + (1 - y) K2HPO4}(aq) system, few or no mixing terms were needed for the three models because the ionic strength dependences of the osmotic coefficients of K2SO4(aq) and K2HPO4(aq) are very similar and their curves nearly parallel, as are those of the mixtures which are intermediate and nearly equally spaced as a function of the ionic strength fraction.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K
EP  - 93
SP  - 84
VL  - 79
DO  - 10.1016/j.jct.2014.07.010
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran P. and Grujić, Snežana",
year = "2014",
abstract = "The molality-based osmotic coefficients of aqueous mixtures of K2SO4 and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic method, at K2SO4 ionic strength fractions y = (0.21008, 0.39887, 0.60657, 0.80517, and 1) over the ionic strength range (1.3167 to 1.9587) mol . kg(-1), using KCl(aq) as the reference standard solution. These osmotic coefficients were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte solution mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. Model parameters for K2SO4(aq) at T = 298.15 K were also evaluated using the present results along with seven sets of osmotic coefficients taken from the published literature. For the {yK(2)SO(4) + (1 - y) K2HPO4}(aq) system, few or no mixing terms were needed for the three models because the ionic strength dependences of the osmotic coefficients of K2SO4(aq) and K2HPO4(aq) are very similar and their curves nearly parallel, as are those of the mixtures which are intermediate and nearly equally spaced as a function of the ionic strength fraction.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K",
pages = "93-84",
volume = "79",
doi = "10.1016/j.jct.2014.07.010"
}

Popović, D., Miladinović, J., Rard, J. A., Miladinović, Z. P.,& Grujić, S.. (2014). Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 79, 84-93.
https://doi.org/10.1016/j.jct.2014.07.010

Popović D, Miladinović J, Rard JA, Miladinović ZP, Grujić S. Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics. 2014;79:84-93.
doi:10.1016/j.jct.2014.07.010 .

Popović, Daniela, Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran P., Grujić, Snežana, "Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K" in Journal of Chemical Thermodynamics, 79 (2014):84-93,
https://doi.org/10.1016/j.jct.2014.07.010 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Miladinović, Zoran P.
AU  - Grujić, Snežana
AU  - Todorović, Milica D.
AU  - Rard, Joseph A.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2532
AB  - The molality-based osmotic coefficients of aqueous mixtures of KBr and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic method at KBr ionic strength fractions y = (0.18328, 0.38241, 0.58031, 0.79186, and 1) and over the ionic strength range (2.5452 to 10.0418) mol . kg (-1), using KCl(aq) and CaCl2(aq) as the reference standard solutions. These experiments were performed using glass sample dishes because preliminary experiments showed that some corrosion of our usual gold-plated silver dishes occurred with dissolution of silver, presumably by "pinhole" corrosion at imperfections in the gold layer. These osmotic coefficients were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. The present assessment yields mixing parameters for these models. Model parameters for KBr(aq) at T = (298.15 +/- 0.01) K were also evaluated using the present results along with four sets of osmotic coefficients taken from the published literature. For the {yKBr + (1 -y)K2HPO4}(aq) system, the model with five Scatchard mixing terms gave a significantly better representation of the osmotic coefficients than any of the other models and is therefore recommended for calculation of osmotic and activity coefficients.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of the {yKBr + (1-y)K2HPO4}(aq) system at T=298.15 K
EP  - 161
SP  - 151
VL  - 62
DO  - 10.1016/j.jct.2013.03.003
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Miladinović, Zoran P. and Grujić, Snežana and Todorović, Milica D. and Rard, Joseph A.",
year = "2013",
abstract = "The molality-based osmotic coefficients of aqueous mixtures of KBr and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic method at KBr ionic strength fractions y = (0.18328, 0.38241, 0.58031, 0.79186, and 1) and over the ionic strength range (2.5452 to 10.0418) mol . kg (-1), using KCl(aq) and CaCl2(aq) as the reference standard solutions. These experiments were performed using glass sample dishes because preliminary experiments showed that some corrosion of our usual gold-plated silver dishes occurred with dissolution of silver, presumably by "pinhole" corrosion at imperfections in the gold layer. These osmotic coefficients were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for this ternary system. The present assessment yields mixing parameters for these models. Model parameters for KBr(aq) at T = (298.15 +/- 0.01) K were also evaluated using the present results along with four sets of osmotic coefficients taken from the published literature. For the {yKBr + (1 -y)K2HPO4}(aq) system, the model with five Scatchard mixing terms gave a significantly better representation of the osmotic coefficients than any of the other models and is therefore recommended for calculation of osmotic and activity coefficients.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of the {yKBr + (1-y)K2HPO4}(aq) system at T=298.15 K",
pages = "161-151",
volume = "62",
doi = "10.1016/j.jct.2013.03.003"
}

Popović, D., Miladinović, J., Miladinović, Z. P., Grujić, S., Todorović, M. D.,& Rard, J. A.. (2013). Isopiestic determination of the osmotic and activity coefficients of the {yKBr + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 62, 151-161.
https://doi.org/10.1016/j.jct.2013.03.003

Popović D, Miladinović J, Miladinović ZP, Grujić S, Todorović MD, Rard JA. Isopiestic determination of the osmotic and activity coefficients of the {yKBr + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics. 2013;62:151-161.
doi:10.1016/j.jct.2013.03.003 .

Popović, Daniela, Miladinović, Jelena, Miladinović, Zoran P., Grujić, Snežana, Todorović, Milica D., Rard, Joseph A., "Isopiestic determination of the osmotic and activity coefficients of the {yKBr + (1-y)K2HPO4}(aq) system at T=298.15 K" in Journal of Chemical Thermodynamics, 62 (2013):151-161,
https://doi.org/10.1016/j.jct.2013.03.003 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Miladinović, Zoran P.
AU  - Ivošević, Branislav
AU  - Todorović, Milica D.
AU  - Rard, Joseph A.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2112
AB  - The osmotic coefficients of aqueous mixtures of KNO3 and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic vapor pressure method at KNO3 ionic strength fractions y = (0.20581, 0.43631, 0.61099, and 0.83170), over the ionic strength range (2.4958 to 6.0801) mol.kg (1), using KCl(aq) and CaCl2(aq) as the reference standard solutions. These measurements include some new isopiestic results for the KNO3(aq) binary system extending slightly into the oversaturated (supersaturated) molality region from (2.1973 to 4.1295) mol.kg (1). Our new experimental results were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for the {yKNO(3) + (1 - y)K2HPO4}(aq) system. The present assessment yields NO3 - HPO42 mixing parameters for these models that are needed for modeling the thermodynamic activities of solute components of natural waters and other complex aqueous electrolyte mixtures. Model parameters for KNO3(aq) at T = (298.15 +/- 0.01) K were also evaluated using the present results along with critically-assessed osmotic coefficients taken from the published literature. Thermodynamic properties of the saturated solution were calculated using published solubilities of KNO3(cr) in water at T = 298.15 K and the evaluated ion-interaction model parameters for KNO3(aq).
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of the {yKNO(3) + (1-y)K2HPO4}(aq) system at T=298.15 K
EP  - 183
SP  - 172
VL  - 55
DO  - 10.1016/j.jct.2012.06.027
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Miladinović, Zoran P. and Ivošević, Branislav and Todorović, Milica D. and Rard, Joseph A.",
year = "2012",
abstract = "The osmotic coefficients of aqueous mixtures of KNO3 and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic vapor pressure method at KNO3 ionic strength fractions y = (0.20581, 0.43631, 0.61099, and 0.83170), over the ionic strength range (2.4958 to 6.0801) mol.kg (1), using KCl(aq) and CaCl2(aq) as the reference standard solutions. These measurements include some new isopiestic results for the KNO3(aq) binary system extending slightly into the oversaturated (supersaturated) molality region from (2.1973 to 4.1295) mol.kg (1). Our new experimental results were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual Pitzer mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There are no previously published isopiestic measurements for the {yKNO(3) + (1 - y)K2HPO4}(aq) system. The present assessment yields NO3 - HPO42 mixing parameters for these models that are needed for modeling the thermodynamic activities of solute components of natural waters and other complex aqueous electrolyte mixtures. Model parameters for KNO3(aq) at T = (298.15 +/- 0.01) K were also evaluated using the present results along with critically-assessed osmotic coefficients taken from the published literature. Thermodynamic properties of the saturated solution were calculated using published solubilities of KNO3(cr) in water at T = 298.15 K and the evaluated ion-interaction model parameters for KNO3(aq).",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of the {yKNO(3) + (1-y)K2HPO4}(aq) system at T=298.15 K",
pages = "183-172",
volume = "55",
doi = "10.1016/j.jct.2012.06.027"
}

Popović, D., Miladinović, J., Miladinović, Z. P., Ivošević, B., Todorović, M. D.,& Rard, J. A.. (2012). Isopiestic determination of the osmotic and activity coefficients of the {yKNO(3) + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 55, 172-183.
https://doi.org/10.1016/j.jct.2012.06.027

Popović D, Miladinović J, Miladinović ZP, Ivošević B, Todorović MD, Rard JA. Isopiestic determination of the osmotic and activity coefficients of the {yKNO(3) + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics. 2012;55:172-183.
doi:10.1016/j.jct.2012.06.027 .

Popović, Daniela, Miladinović, Jelena, Miladinović, Zoran P., Ivošević, Branislav, Todorović, Milica D., Rard, Joseph A., "Isopiestic determination of the osmotic and activity coefficients of the {yKNO(3) + (1-y)K2HPO4}(aq) system at T=298.15 K" in Journal of Chemical Thermodynamics, 55 (2012):172-183,
https://doi.org/10.1016/j.jct.2012.06.027 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Todorović, Milica D.
AU  - Zrilić, Milorad
AU  - Rard, Joseph A.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1872
AB  - The osmotic coefficients of aqueous mixtures of KCl and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic vapor pressure method over the range of ionic strengths from (2.3700 to 11.250) mol . kg(-1) using CaCl2(aq) as the reference solution. Our new experimental results were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There is a dearth of previously published isopiestic data for mixtures containing salts of HPO42- (aq) and, consequently, no previous measurements are available for comparison with the present results. The present study yields Cl--HPO42- mixing parameters for these three models that are needed for modeling the thermodynamic activities of solute components of natural waters and other complex aqueous electrolyte mixtures.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Isopiestic determination of the osmotic and activity coefficients of the {yKCl + (1-y)K2HPO4}(aq) system at T=298.15 K
EP  - 1885
IS  - 12
SP  - 1877
VL  - 43
DO  - 10.1016/j.jct.2011.06.017
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Todorović, Milica D. and Zrilić, Milorad and Rard, Joseph A.",
year = "2011",
abstract = "The osmotic coefficients of aqueous mixtures of KCl and K2HPO4 have been measured at T = (298.15 +/- 0.01) K by the isopiestic vapor pressure method over the range of ionic strengths from (2.3700 to 11.250) mol . kg(-1) using CaCl2(aq) as the reference solution. Our new experimental results were modeled with an extended form of Pitzer's ion-interaction model equations, both with the usual mixing terms and with Scatchard's neutral-electrolyte mixing terms, and with the Clegg-Pitzer-Brimblecombe equations based on the mole-fraction-composition scale. There is a dearth of previously published isopiestic data for mixtures containing salts of HPO42- (aq) and, consequently, no previous measurements are available for comparison with the present results. The present study yields Cl--HPO42- mixing parameters for these three models that are needed for modeling the thermodynamic activities of solute components of natural waters and other complex aqueous electrolyte mixtures.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Isopiestic determination of the osmotic and activity coefficients of the {yKCl + (1-y)K2HPO4}(aq) system at T=298.15 K",
pages = "1885-1877",
number = "12",
volume = "43",
doi = "10.1016/j.jct.2011.06.017"
}

Popović, D., Miladinović, J., Todorović, M. D., Zrilić, M.,& Rard, J. A.. (2011). Isopiestic determination of the osmotic and activity coefficients of the {yKCl + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 43(12), 1877-1885.
https://doi.org/10.1016/j.jct.2011.06.017

Popović D, Miladinović J, Todorović MD, Zrilić M, Rard JA. Isopiestic determination of the osmotic and activity coefficients of the {yKCl + (1-y)K2HPO4}(aq) system at T=298.15 K. in Journal of Chemical Thermodynamics. 2011;43(12):1877-1885.
doi:10.1016/j.jct.2011.06.017 .

Popović, Daniela, Miladinović, Jelena, Todorović, Milica D., Zrilić, Milorad, Rard, Joseph A., "Isopiestic determination of the osmotic and activity coefficients of the {yKCl + (1-y)K2HPO4}(aq) system at T=298.15 K" in Journal of Chemical Thermodynamics, 43, no. 12 (2011):1877-1885,
https://doi.org/10.1016/j.jct.2011.06.017 . .

TY  - JOUR
AU  - Popović, Daniela
AU  - Miladinović, Jelena
AU  - Todorović, Milica D.
AU  - Zrilić, Milorad
AU  - Rard, Joseph A.
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1964
AB  - The osmotic coefficients of K2HPO4(aq) have been measured at T=298.15 K by the isopiestic vapor pressure method over the range of molalities from 1.3846 mola  lt ...kg(-1) to 13.939 mola  lt ...kg(-1) (oversaturation) with CaCl2(aq) as the reference solution. The molalities and osmotic coefficients of saturated solutions in equilibrium with K(2)HPO(4)a  lt ...xH(2)O(cr) were measured simultaneously by the same method. Available literature osmotic coefficients of K2HPO4(aq) at T=298.15 K, and our new experimental data, were combined and modeled using an extended form of Pitzer's equation and the Clegg-Pitzer-Brimblecombe equation based on the mole-fraction-composition scale. These equations were used to calculate the activity coefficients of K2HPO4(aq) at T=298.15 K.
PB  - Springer/Plenum Publishers, New York
T2  - Journal of Solution Chemistry
T1  - Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K
EP  - 920
IS  - 5
SP  - 907
VL  - 40
DO  - 10.1007/s10953-011-9650-1
ER  - 

@article{
author = "Popović, Daniela and Miladinović, Jelena and Todorović, Milica D. and Zrilić, Milorad and Rard, Joseph A.",
year = "2011",
abstract = "The osmotic coefficients of K2HPO4(aq) have been measured at T=298.15 K by the isopiestic vapor pressure method over the range of molalities from 1.3846 mola  lt ...kg(-1) to 13.939 mola  lt ...kg(-1) (oversaturation) with CaCl2(aq) as the reference solution. The molalities and osmotic coefficients of saturated solutions in equilibrium with K(2)HPO(4)a  lt ...xH(2)O(cr) were measured simultaneously by the same method. Available literature osmotic coefficients of K2HPO4(aq) at T=298.15 K, and our new experimental data, were combined and modeled using an extended form of Pitzer's equation and the Clegg-Pitzer-Brimblecombe equation based on the mole-fraction-composition scale. These equations were used to calculate the activity coefficients of K2HPO4(aq) at T=298.15 K.",
publisher = "Springer/Plenum Publishers, New York",
journal = "Journal of Solution Chemistry",
title = "Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K",
pages = "920-907",
number = "5",
volume = "40",
doi = "10.1007/s10953-011-9650-1"
}

Popović, D., Miladinović, J., Todorović, M. D., Zrilić, M.,& Rard, J. A.. (2011). Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K. in Journal of Solution Chemistry
Springer/Plenum Publishers, New York., 40(5), 907-920.
https://doi.org/10.1007/s10953-011-9650-1

Popović D, Miladinović J, Todorović MD, Zrilić M, Rard JA. Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K. in Journal of Solution Chemistry. 2011;40(5):907-920.
doi:10.1007/s10953-011-9650-1 .

Popović, Daniela, Miladinović, Jelena, Todorović, Milica D., Zrilić, Milorad, Rard, Joseph A., "Isopiestic Determination of the Osmotic and Activity Coefficients of K2HPO4(aq), Including Saturated and Supersaturated Solutions, at T=298.15 K" in Journal of Solution Chemistry, 40, no. 5 (2011):907-920,
https://doi.org/10.1007/s10953-011-9650-1 . .

TY  - JOUR
AU  - Miladinović, Jelena
AU  - Ninković, Rozalija
AU  - Todorović, Milica D.
AU  - Rard, Joseph A.
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1262
AB  - Isopiestic vapor-pressure measurements were made for {yMgCl(2) + (1-y)MgSO4}(aq) solutions with MgCl2 ionic strength fractions of y = (0,0.1997,0.3989,0.5992,0.8008, and 1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements for the mixtures cover the ionic strength range I=0.9794 to 9.4318 mol.kg(-1). In addition, isopiestic measurements were made with NaCl(aq) as reference standard for mixtures of {xNa(2)SO(4) + (1-x)MgSO4}(aq) with the molality fraction x = 0.5000 that correspond to solutions of the evaporite mineral bloedite (astrakanite), Na2Mg(SO4)(2).4H(2)O(cr). The total molalities, m (T)=m(Na2SO4) + m(MgSO4), range from m(T) = 1.4479 to 4.4312 mol.kg(-1) (I=5.0677 to 15.509 mol.kg(-1)), where the uppermost concentration is the highest oversaturation molality that could be achieved by isothermal evaporation of the solvent at 298.15 K. The parameters of an extended ion-interaction (Pitzer) model for MgCl2(aq) at 298.15 K, which were required for an analysis of the {yMgCl(2) + (1-y)MgSO4}(aq) mixture results, were evaluated up to I=12.075 mol.kg(-1) from published isopiestic data together with the six new osmotic coefficients obtained in this study. Osmotic coefficients of {yMgCl(2) + (1-y)MgSO4}(aq) solutions from the present study, along with critically-assessed values from previous studies, were used to evaluate the mixing parameters of the extended ion-interaction model.
PB  - Springer/Plenum Publishers, New York
T2  - Journal of Solution Chemistry
T1  - Isopiestic investigation of the osmotic and activity coefficients of {yMgCl(2)+(1-y)MgSO4}(aq) and the osmotic coefficients of Na2SO4 center dot MgSO4(aq) at 298.15 K
EP  - 329
IS  - 3
SP  - 307
VL  - 37
DO  - 10.1007/s10953-007-9238-y
ER  - 

@article{
author = "Miladinović, Jelena and Ninković, Rozalija and Todorović, Milica D. and Rard, Joseph A.",
year = "2008",
abstract = "Isopiestic vapor-pressure measurements were made for {yMgCl(2) + (1-y)MgSO4}(aq) solutions with MgCl2 ionic strength fractions of y = (0,0.1997,0.3989,0.5992,0.8008, and 1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements for the mixtures cover the ionic strength range I=0.9794 to 9.4318 mol.kg(-1). In addition, isopiestic measurements were made with NaCl(aq) as reference standard for mixtures of {xNa(2)SO(4) + (1-x)MgSO4}(aq) with the molality fraction x = 0.5000 that correspond to solutions of the evaporite mineral bloedite (astrakanite), Na2Mg(SO4)(2).4H(2)O(cr). The total molalities, m (T)=m(Na2SO4) + m(MgSO4), range from m(T) = 1.4479 to 4.4312 mol.kg(-1) (I=5.0677 to 15.509 mol.kg(-1)), where the uppermost concentration is the highest oversaturation molality that could be achieved by isothermal evaporation of the solvent at 298.15 K. The parameters of an extended ion-interaction (Pitzer) model for MgCl2(aq) at 298.15 K, which were required for an analysis of the {yMgCl(2) + (1-y)MgSO4}(aq) mixture results, were evaluated up to I=12.075 mol.kg(-1) from published isopiestic data together with the six new osmotic coefficients obtained in this study. Osmotic coefficients of {yMgCl(2) + (1-y)MgSO4}(aq) solutions from the present study, along with critically-assessed values from previous studies, were used to evaluate the mixing parameters of the extended ion-interaction model.",
publisher = "Springer/Plenum Publishers, New York",
journal = "Journal of Solution Chemistry",
title = "Isopiestic investigation of the osmotic and activity coefficients of {yMgCl(2)+(1-y)MgSO4}(aq) and the osmotic coefficients of Na2SO4 center dot MgSO4(aq) at 298.15 K",
pages = "329-307",
number = "3",
volume = "37",
doi = "10.1007/s10953-007-9238-y"
}

Miladinović, J., Ninković, R., Todorović, M. D.,& Rard, J. A.. (2008). Isopiestic investigation of the osmotic and activity coefficients of {yMgCl(2)+(1-y)MgSO4}(aq) and the osmotic coefficients of Na2SO4 center dot MgSO4(aq) at 298.15 K. in Journal of Solution Chemistry
Springer/Plenum Publishers, New York., 37(3), 307-329.
https://doi.org/10.1007/s10953-007-9238-y

Miladinović J, Ninković R, Todorović MD, Rard JA. Isopiestic investigation of the osmotic and activity coefficients of {yMgCl(2)+(1-y)MgSO4}(aq) and the osmotic coefficients of Na2SO4 center dot MgSO4(aq) at 298.15 K. in Journal of Solution Chemistry. 2008;37(3):307-329.
doi:10.1007/s10953-007-9238-y .

Miladinović, Jelena, Ninković, Rozalija, Todorović, Milica D., Rard, Joseph A., "Isopiestic investigation of the osmotic and activity coefficients of {yMgCl(2)+(1-y)MgSO4}(aq) and the osmotic coefficients of Na2SO4 center dot MgSO4(aq) at 298.15 K" in Journal of Solution Chemistry, 37, no. 3 (2008):307-329,
https://doi.org/10.1007/s10953-007-9238-y . .

TY  - JOUR
AU  - Ninković, Rozalija
AU  - Miladinović, Jelena
AU  - Todorović, Milica D.
AU  - Grujić, Snežana
AU  - Rard, Joseph A.
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1089
AB  - Isopiestic vapor pressure measurements were made for {xZnCl(2)+(1-x)ZnSO4}(aq) solutions with ZnCl2 molality fractions of x=(0,0.3062,0.5730,0.7969, and 1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements cover the water activity range 0.901-0.919  lt = a(w)  lt = 0.978. The experimental osmotic coefficients were used to evaluate the parameters of an extended ion-interaction (Pitzer) model for these mixed electrolyte solutions. A similar analysis was made of the available activity data for ZnCl2(aq) at 298.15 K, while assuming the presence of equilibrium amounts of ZnCl+(aq) ion-pairs, to derive the ion-interaction parameters for the hypothetical pure binary electrolytes (Zn2+,2Cl(-)) and (ZnCl+,Cl-). These parameters are required for the analysis of the mixture results. Although significant concentrations of higher-order zinc chloride complexes may also be present in these solutions, it was possible to represent the osmotic coefficients accurately by explicitly including only the predominant complex ZnCl+(aq) and the completely dissociated ions. The ionic activity coefficients and osmotic coefficients were calculated over the investigated molality range using the evaluated extended Pitzer model parameters.
PB  - Springer/Plenum Publishers, New York
T2  - Journal of Solution Chemistry
T1  - Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K
EP  - 435
IS  - 4
SP  - 405
VL  - 36
DO  - 10.1007/s10953-007-9128-3
ER  - 

@article{
author = "Ninković, Rozalija and Miladinović, Jelena and Todorović, Milica D. and Grujić, Snežana and Rard, Joseph A.",
year = "2007",
abstract = "Isopiestic vapor pressure measurements were made for {xZnCl(2)+(1-x)ZnSO4}(aq) solutions with ZnCl2 molality fractions of x=(0,0.3062,0.5730,0.7969, and 1) at the temperature 298.15 K, using KCl(aq) as the reference standard. These measurements cover the water activity range 0.901-0.919  lt = a(w)  lt = 0.978. The experimental osmotic coefficients were used to evaluate the parameters of an extended ion-interaction (Pitzer) model for these mixed electrolyte solutions. A similar analysis was made of the available activity data for ZnCl2(aq) at 298.15 K, while assuming the presence of equilibrium amounts of ZnCl+(aq) ion-pairs, to derive the ion-interaction parameters for the hypothetical pure binary electrolytes (Zn2+,2Cl(-)) and (ZnCl+,Cl-). These parameters are required for the analysis of the mixture results. Although significant concentrations of higher-order zinc chloride complexes may also be present in these solutions, it was possible to represent the osmotic coefficients accurately by explicitly including only the predominant complex ZnCl+(aq) and the completely dissociated ions. The ionic activity coefficients and osmotic coefficients were calculated over the investigated molality range using the evaluated extended Pitzer model parameters.",
publisher = "Springer/Plenum Publishers, New York",
journal = "Journal of Solution Chemistry",
title = "Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K",
pages = "435-405",
number = "4",
volume = "36",
doi = "10.1007/s10953-007-9128-3"
}

Ninković, R., Miladinović, J., Todorović, M. D., Grujić, S.,& Rard, J. A.. (2007). Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K. in Journal of Solution Chemistry
Springer/Plenum Publishers, New York., 36(4), 405-435.
https://doi.org/10.1007/s10953-007-9128-3

Ninković R, Miladinović J, Todorović MD, Grujić S, Rard JA. Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K. in Journal of Solution Chemistry. 2007;36(4):405-435.
doi:10.1007/s10953-007-9128-3 .

Ninković, Rozalija, Miladinović, Jelena, Todorović, Milica D., Grujić, Snežana, Rard, Joseph A., "Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K" in Journal of Solution Chemistry, 36, no. 4 (2007):405-435,
https://doi.org/10.1007/s10953-007-9128-3 . .