A G(E) MODEL FOR SINGLE AND MIXED-SOLVENT ELECTROLYTE SYSTEMS .1. MODEL AND RESULTS FOR STRONG ELECTROLYTES

A g(E) model for electrolyte systems has been developed which is based on results from statistical thermodynamics and takes into account the interactions between all species present in the electrolyte solution. In this model the electrolyte solution is treated as a nonelectrolyte solution plus charge interactions, and it is assumed that the charge interactions show two effects, direct and indirect. The indirect effect differs not only from the long-range electrostatic interaction but also from the short-range interaction for nonelectrolyte solutions. With the help of a large data base the required parameters (164 in number) have been fitted for 10 solvents, 18 cations and 10 anions. The model parameters have been used to calculate the VLE behavior, osmotic coefficients and mean ion activity coefficients for a large number of systems with high accuracy.