Ionic Equilibria in Mixed Solvents. XII. Hydrolysis of Cadmium(II) Ion in Dioxane–Water and Methanol–Water Mixtures

Abstract

Abstract The hydrolytic reactions of cadmium(II) ions were studied at 25 °C in dioxane–water and methanol–water mixtures with varying compositions of the organic solvents, each mixture containing 3 mol dm−3 (Li)ClO4 as an ionic medium. Emf measurements were carried out over the range of the total cadmium(II) concentrations of 0.2 to 0.8 mol dm−3 in all the systems. Two complexes Cd2OH3+ and CdOH+ were found in the dioxane–water mixtures, but the latter complex was not detected in the methanol–water system. The formation constant of the Cd2OH3+ complex was slightly larger in the methanol–water mixtures than in the dioxane–water mixtures at the same mole-fraction concentration of the organic solvents.