Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K
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2014
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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.
Ključne reči:
Aqueous solutions / Isopiestic measurements / K2SO4 / K2HPO4 / Osmotic coefficients / Activity coefficientsIzvor:
Journal of Chemical Thermodynamics, 2014, 79, 84-93Izdavač:
- Academic Press Ltd- Elsevier Science Ltd, London
Finansiranje / projekti:
- Novi industrijski i ekološki aspekti primene hemijske termodinamike na unapređenje hemijskih procesa sa višefaznim i višekomponentnim sistemima (RS-MESTD-Basic Research (BR or ON)-172063)
DOI: 10.1016/j.jct.2014.07.010
ISSN: 0021-9614
WoS: 000342061300011
Scopus: 2-s2.0-84906497061
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Institucija/grupa
Tehnološko-metalurški fakultetTY - 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 . .