Transport numbers of dilute aqueous cadmium chloride solutions at 298.15 K

Abstract

This paper describes an indirect moving boundary apparatus for determining transport numbers and presents transport numbers of dilute aqueous cadmium chloride solutions at 298.15 K. Below 0.02 mol kg^–1, the variation of transport number with concentration can be reproduced using the Lee and Wheaton equation for the relevant ionic conductivities if the solutions are assumed to contain CdCl⁺ and CdCl₂ as well as Cd²⁺ and Cl^–. However, it is not possible to account for the concentration dependence of both transport number and conductivity by means of this equation unless different values of λ_CdCl⁺° are used in the two analyses.