Ternary diffusion in aqueous NaCl + MgCl 2 solutions at 25°C

Abstract

A conductimetric method has been used to measure ternary diffusion coefficients for aqueous NaCl + MgCl 2 solutions at 25°C. The measurements were made at total salt concentrations from 0.01–0.5 M for NaCl : MgCl 2 ratios 1 : 3, 1 : 1 and 3 : 1. Binary thermodynamic, viscosity and mobility data for NaCl + water and MgCl 2 + water solutions are used to predict ternary diffusion coefficients for the NaCl + MgCl 2 solutions. Qualitative agreement is obtained with optical and conductimetric data for ionic strengths up to 2 M.