Individual ionic activity coefficients from a symmetric Poisson–Boltzmann theory

Abstract

A symmetric Poisson–Boltzmann equation is used to calculate individual activity coefficients for 1 : 1 and 2 : 1 primitive model electrolytes. Comparisons are made with the mean-spherical approximation and hypernetted chain integral equation predictions and available Monte Carlo simulation results. A brief comparison is also made with the mean-spherical approximation and Monte Carlo results for the aqueous mixture KCl–KF.