Mutual diffusion in concentrated aqueous potassium hydroxide solutions

Abstract

Experimental measurements have been made of the mutual diffusion coefficient of aqueous potassium hydroxide solutions over the concentration range from zero to saturated, using the diaphragm cell method of Stokes. Values are reported for three temperatures in the range 25–65°C. A simple activation theory of diffusion in concentrated electrolytes is presented, and is shown to describe satisfactorily the concentration dependence at each temperature. The behaviour of the mutual diffusion coefficient is compared with that of other transport coefficients of aqueous potassium hydroxide solutions, within the general framework of the activation theory.