Thermodynamics of {zNaCl+(1−z)Na2SO4}(aq) from T=278.15K to T=318.15K, and representation with an extended ion-interaction (Pitzer) model

Rard, Joseph A., Clegg, Simon L. and Platford, Robert F. (2003) Thermodynamics of {zNaCl+(1−z)Na2SO4}(aq) from T=278.15K to T=318.15K, and representation with an extended ion-interaction (Pitzer) model. Journal of Chemical Thermodynamics, 35 (6). pp. 967-1008.

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Abstract

In 1968, R.F. Platford reported the results from extensive isopiestic vapor-pressure measurements for the {zNaCl + (1 - z)Na2SO4}(aq) system at T = 298.15 K, using NaCl(aq) as the isopiestic reference standard [R.F. Platford, J. Chem. Eng. Data 13 (1968) 46-48]. However, only derived quantities were reported, and the experimental isopiestic equilibrium molalities were not given. The complete set of original isopiestic molalities from that study is tabulated in the present report. In addition, published thermodynamic information for this system is reviewed and the isopiestic equilibrium molalities, electromotive force measurements for five different types of electrochemical cells, and enthalpies of mixing from these other studies are critically assessed and recalculated consistently. These combined results are used to evaluate at T = 298.15 K the two mixing parameters of Pitzer's ion-interaction model, sT(Cl, SO4) = (1.236 ± 0.0325) · 10-2kg·mol-1 and ?(Na, Cl, SO4) = (1.808 ± 0.086) · 10-3 kg2 · mol-2, and their temperature derivatives {?-ST(Cl, SO4)/?T}p = (2.474 ±0.460) · 10-5 kg · mol-1 · K-1 and {??(Na, Cl, SO4)/?T}p = -(6.228 ± 0.186) · 10-5kg2 · mol-2 · K-1. Also reported are parameters for an extended ion-interaction model for Na2SO4(aq), valid from T = (273.15 to 323.15)K, that were required for this mixed electrolyte solution analysis.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 16 May 2011 14:36
Last Modified: 30 Apr 2020 23:47
URI: https://ueaeprints.uea.ac.uk/id/eprint/30613
DOI: 10.1016/S0021-9614(03)00043-0

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