Abstract
The Debye-Huckel equation for ion interactions in a dielectric medium is in widespread use in phase equilibrium models for electrolyte-containing mixtures. The Debye-Huckel approximation (based on point molecules) does not properly account for free-volume effects for real molecules. The Mean Spherical Approximation Model derived by Blum (1975) properly accounts for the hard-sphere free volume in the screening factor, internal energy, and other thermodynamic properties. However, the screening factor relation is implicit and requires iteration to compute. A non-iterative MSA screening factor relation showing proper variation of internal energy with molecular size has been developed. Comparisons of predicted internal energy to those of Blum are shown for ion sizes up to 3A°.
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