Ionic Equilibria in Mixed Solvents. VII. Hydrolysis of Copper(II) Ion in Dioxane-Water Mixtures containing 3 m (Li)ClO4 as an Ionic Medium

Abstract

Abstract The hydrolytic reactions of copper(II) ion were studied at 25°C in water, in 0.1 and 0.5 mole fraction dioxane-water mixtures, each containing 3 m (Li) ClO4 as an ionic medium. Emf measurements were carried out in the range of the total copper(II) concentration of 0.01125–0.07106 m (in water), 0.01548–0.1356 m (in the 0.1 mole fraction dioxane-water mixture), and 0.02257–0.1231 m (in the 0.5 mole fraction dioxane-water mixture), respectively. Species formed and their formation constants determined (log*βp,q) are: CuOH (−7.54±0.02), Cu2OH (−6.22±0.02), Cu2(OH)2 (−11.12±0.05), and Cu3(OH)2 (−10.36±0.05) in water; CuOH (−7.44±0.02), Cu2OH (−6.22±0.02), Cu2(OH)2 (−11.35±0.05), and Cu3(OH)2 (−10.12±0.08) in the 0.1 mole fraction dioxane-water mixture; CuOH (−7.74±0.02), and Cu2OH (−6.40±0.02) in the 0.5 mole fraction dioxane-water mixture.