Electrochemical studies of molten salts. IV. Electromotive forces of concentration cells with transference and diffusion potentials for PbCl₂+KCl mixtures

Abstract

The e.m.f.'s of concentration cells with transference containing PbCl₂+KCl molten mixtures have been measured as functions of temperature and electrolyte composition, and compared with previously published data. Graphs of cell e.m.f. against temperature are sets of intersecting straight lines, as are graphs of cell e.m.f. against the negative logarithm of the mole fraction of PbCl₂.     Diffusion potentials for junctions between pure PbCl₂ and PbCl₂+KCl mixtures have been evaluated, as functions of temperature and mixture composition.     The interpretation of the results supports the hypothesis of the existence of complex lead-chloro ionic species in the electrolytes.