Thermodynamics of Electrolytes. 13. Ionic Strength Dependence of Higher-Order Terms; Equations for CaCl2 and MgCl2

Autor:	Simon L. Clegg, Joseph A. Rard, Peiming Wang, Kenneth S. Pitzer
Rok vydání:	1999
Předmět:	Activity coefficient Molality Chemistry Biophysics Thermodynamics Electrolyte Biochemistry Virial coefficient Ionic strength Pitzer equations Osmotic coefficient Physical and Theoretical Chemistry Solubility Molecular Biology
Zdroj:	Journal of Solution Chemistry. 28:265-282
ISSN:	1572-8927 0095-9782
DOI:	10.1023/a:1022695525943
Popis:	While the original ion-interaction (Pitzer) equations of 1973 were adequate for many electrolytes to the limit of solubility, additional terms are needed for some systems of large solubility. A simple pattern of ionic-strength dependence is proposed for third, fourth, and higher virial coefficients. It is found to be very effective in representing the complex behavior of CaCl2(aq) as well as that of MgCl2(aq) at 25°C. Equations without ion association are presented for each system that are valid for the full range to 11.0 and 5.9 mol-kg−1, respectively, as well as simpler equations for limited molality ranges.
Databáze:	OpenAIRE
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