An attempt to define generally isothermal differences in the chemical potentials of individual ionic species in solution

Abstract

By using an intuitively attractive hypothesis, a general expression is derived for isothermal changes in the chemical potentials of individual ionic species in solution which in turn enables partial ionic volumes and isothermal changes in partial ionic entropies to be defined. The definition is entirely consistent with that of the primary medium effect given previously and includes it as a limiting case. The same assumption also enables an expression to be derived for the asymptotic behaviour of the radial distribution functions of the various species in solution with respect to each other which leads to an improved definition of the degree of supersociation previously defined by Guggenheim. For very dilute solutions of associating ionic solutes, the same expressions for the d_µi result as hold for a similar solution of uncharged aggregates.