Representation of Electrical Conductances by the Quint–Viallard Conductivity Equation. Part 6. Unsymmetrical 2:1 Type “Complex Ions” Electrolytes: Cadmium Bromide and Cadmium Iodide

Abstract

Systematic and precise measurements of electrical conductivities of dilute aqueous solutions of cadmium bromide and cadmium iodide were performed from 15 to 35 °C. The conductances were interpreted in terms of a molecular model that includes a mixture of two 1:1 and 2:1 electrolytes. The molar limiting conductances of $$ \lambda $$ 0(CdX+, T) ions, the equilibrium constants of formation of CdX+ complexes K(T) and the corresponding standard thermodynamic functions were evaluated using the Quint–Viallard conductance equations, the Debye–Huckel equations for activity coefficients and the mass action equations. Mathematical representations are also presented to an extension of molecular models, to the simultaneous formation of MeX+ and MeX2 species and to the possibility of hydrolysis reactions with formation of Me(OH)+ ions.