A unified approach for prediction of thermodynamic properties of aqueous mixed‐electrolyte solutions. Part I: Vapor pressure and heat of vaporization

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Abstract
The overall nonideality of an aqueous mixed electrolyte solution is characterized in terms of a newly defined parameter Γ*, called the overall reduced ionic activity coefficient. It is shown that Γ* for the mixed solution is simply related to the properties of single‐electrolyte solutions. Γ* is related to the vapor pressure of a mixed‐electrolyte solution through well‐known thermodynamic equations. This leads to a predictive equation for the vapor pressure of a mixed‐electrolyte solution in terms of the vapor pressures of single‐electrolyte solutions of the components. This equation is valid over the entire concentration range encountered in practice, without any empirical constants, and has a predictive accuracy of 2%. A predictive equation for the latent heat of vaporization is also developed and tested against experimental data.

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