Isopiestic determination of the osmotic and activity coefficients of the {yK(2)SO(4) + (1-y)K2HPO4}(aq) system at T=298.15 K
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.
Keywords:
Osmotic coefficients / K2SO4 / K2HPO4 / Isopiestic measurements / Aqueous solutions / Activity coefficientsSource:
Journal of Chemical Thermodynamics, 2014, 79, 84-93Publisher:
- Academic Press Ltd- Elsevier Science Ltd, London
Funding / projects:
- New industrial and environmental application of chemical thermodynamics to the development of the chemical processes with multiphase and multicomponent systems (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
Collections
Institution/Community
Institut za opštu i fizičku hemijuTY - JOUR AU - Popović, Daniela Z. AU - Miladinović, Jelena AU - Rard, Joseph A. AU - Miladinović, Zoran AU - Grujić, Snežana PY - 2014 UR - https://riofh.iofh.bg.ac.rs/handle/123456789/320 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 UR - conv_508 ER -
@article{ author = "Popović, Daniela Z. and Miladinović, Jelena and Rard, Joseph A. and Miladinović, Zoran 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", url = "conv_508" }
Popović, D. Z., Miladinović, J., Rard, J. A., Miladinović, Z.,& 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 conv_508
Popović DZ, Miladinović J, Rard JA, Miladinović Z, 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 conv_508 .
Popović, Daniela Z., Miladinović, Jelena, Rard, Joseph A., Miladinović, Zoran, 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 ., conv_508 .