This work is an extension to a nonprimitive model of electrolyte solutions of the mean spherical approximation. The mean spherical approximation has been solved for a model where molecules are considered as hard spheres of different sizes with additional short-range interactions represented by an attractive potential which is a Dirac function situated at the surface of the spheres and Coulomb long-range forces for ionic interactions. The resulting simple analytical expression for the Helmholtz energy of the mixture can be used to represent within 1 % the experimental osmotic coefficients of fully dissociated salt solutions in water up to 6 M concentrations. Parameters are the ionic hydrated diameters of cations and attractive potential characteristic parameters. The liquid density and subcritical vapor-liquid equilibria of the solvents ammonia and water are represented by using the same parameters.
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