Thermodynamic modeling of concentrated aqueous electrolyte and nonelectrolyte solutions



A new approach is presented for calculation of activity coefficients in aqueous electrolyte solutions. This approach requires only standard thermodynamic properties for the pure components and for the solutes at infinite dilution. No adjustable mixture parameters are necessary. This new procedure has been applied to calculate: (1) the solubility of salts and the activity of water in binary aqueous solutions; (2) the temperature dependence of the solubility of salts; (3) the azeotropic composition of a system containing a volatile electrolyte, (H2[BOND]HNO3); (4) the solubility of carbon dioxide in water at elevated pressures and at different temperatures.