ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dissociation model of the electrical-conductivity of molten salt mixtures. 6. Systems containing bivalent cation

M. Chrenková, M. Hura, and V. Daněk

Institute of Inorganic Chemistry, Slovak Academy of Sciences, CS-842 36 Bratislava

Abstract: The dissociation model of the electrical conductivity of molten salt mixtures, based on the idea of an incomplete dissociation of electrolyte components, was applied in binary systems containing bivalent cation. The systems of the M^ICl-M^IICl₂ (M^I = Li, Na, K, Rb, Cs; M^II = Mg, Ca, Ba, Cd, Pb) type were chosen. It was found that in the given systems the dissociation model may be successfully used. The formation of complex compounds and their dissociation was not considered, as the ionic pair M²⁺ . 2Cl^- may be also formally considered as a complex compound. Alkali metal chlorides are in these systems completely dissociated, whereas the values of the dissociation degree of the chlorides of bivalent metals are substantially lower. The difference of the dissociation degrees of the pure components is directly proportional to the dimension of the alkali cation, which indicates that the bivalent cations possess a higher tendency to form complex anions in the presence of an alkali cation with higher electronegativity.

Full paper in Portable Document Format: 454a457.pdf

Chemical Papers 45 (4) 457–461 (1991)