MODEL FOR THE CONDUCTIVITY OF IONIC MIXTURES WITHIN THE MEAN SPHERICAL APPROXIMATION .1. 3 SIMPLE IONIC SPECIES

We recently obtained simple expressions for the concentration dependen ce of the conductance of an electrolyte with two simple species and a mixture with three ionic species. The Fuoss-Onsager continuity equatio ns were solved using equilibrium pair distribution functions. Various equilibrium pair correlation functions can be used for this purpose; t hose of the MSA theory (mean spherical approximation) yield explicit e xpressions for the variation of conductivity with concentration, which are in good agreement with the experimental data. Aqueous solutions o f NaCl, KCl, and MgCl2 and mixtures of NaCl/KCl and NaCl/MgCl2 were ex amined at concentrations up to 1 equiv of solute per liter.