Abstract

After a short outline of the problems in diffusion and electric conduction in concentrated solutions of a single electrolyte with two kinds of ions, experimental data are reported for aqueous perchloric acid at 25 °C. Conductivity, transport number, diffusion coefficient, and related quantities are presented. The phenomenological coefficients of Non-Equilibrium Thermodynamics are derived from the measurements. All these transport coefficients are plotted against the square root of the molarity and discussed in detail. The most striking feature are the negative values of one of the phenomenological coefficients in the concentration range between 08 and 5 mol/1.

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