Collect. Czech. Chem. Commun. 1994, 59, 2351-2356

Hydration Analysis Based Calculation of Solute Activity Coefficients in Ternary Saturated Solutions

Jitka Eysseltová

Department of Inorganic Chemistry, Charles University, 128 40 Prague 2, Czech Republic


Based on recently developed hydration analysis of solubility isotherms, a method for calculating activity coefficients of solute in ternary saturated solution is suggested. The method needs no adjustable parameters; it takes only solubility data and the value of the activity coefficient of the respective solute in its binary saturated solution under identical conditions as starting point. In the NaCl - KCl - H2O model system, a comparison between the calculated activity coefficients and those obtained by de Lima and Pitzer from solution properties and from the solubility shows a good agreement over a wide temperature range.