Ionic Equilibria of Electrolytes in Dioxane-Water Mixtures : Potentiometric Studies of Barium, Zinc and Cadmium Chloride

Department of Chemistry, Ravenshaw College, Cuttack-753 003

Manuscript received 21 August 1979, revised 27 October 1981, accepted 7 November 1981

The dissociation constants of barium chloride (K₂), zinc chloride (K₂) and cadmium chloride (K₁ and K₂) have been studied in 10, 20, 30 and 40% (w/w) dioxane ­water mixtures at 25, 30, 35, 40 and 45° in presence of HCl from potentiometric studies. Barium chloride and zinc chloride are found to be completely dissociated upto 0.1 ionic strength (except ZnCI₂ in 40% dioxane). The thermodynamic quantities (∆G°, ∆H^° and ∆S°) for CdCI₂ and for ZnCI₂ (in 40% dioxane) have been calculated at 25°.