Abstract
A reexamination of Guggenheim's theory of specific interactions for dilute aqueous electrolyte solutions shows that the parameters of the theory should include terms for interactions between like-charged ions. The equations developed are analogous to those in Pitzer's treatment of concentrated solutions, and the inclusion of ion-solvent interaction parameters allows comparison with the Stokes and Robinson hydration theory treatment. As with hydration theory, specific-interaction theory predicts differences in single-ion activity coefficients.
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Panckhurst, M.H., Macaskill, J.B. Specific interactions and single-lon activity coefficients in mixed electrolyte solutions. J Solution Chem 5, 469–482 (1976). https://doi.org/10.1007/BF00650464
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DOI: https://doi.org/10.1007/BF00650464