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 λCdCl+° are used in the two analyses.

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