Thermodynamic Properties of Zinc Chloride in Alkali Chloride Melts by Electromotive Force Measurements

Electromotive force measurements on the ZnCl2–ACl systems where A = K, Rb, and Cs were made using cells of the type[Formula: see text]in the temperature range 450° to 800 °C. The partial molar free energies, enthalpies, and excess entropies have been determined from the temperature dependence of the emf results. These thermodynamic properties exhibit increasing negative departure from ideality as the basicity of the alkali metal salt increases. The results are interpreted in terms of an acid–base reaction and are discussed in relation to current models.