Osmotic and activity coefficients of the {xZnCl(2)+(1-x)ZnSO4}(aq) system at 298.15 K
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 accurate...ly 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.
Keywords:
isopiestic measurements / mixed electrolyte solutions / aqueous solutions / zinc chloride / zinc sulfate / extended Pitzer modelSource:
Journal of Solution Chemistry, 2007, 36, 4, 405-435Publisher:
- Springer/Plenum Publishers, New York
DOI: 10.1007/s10953-007-9128-3
ISSN: 0095-9782
WoS: 000246150200001
Scopus: 2-s2.0-34247593507
Institution/Community
Tehnološko-metalurški fakultetTY - 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 . .