Abstract
Copper acetate at pH 6.0 in dioxane-water solvent 25% gives with o-carboxyphenylazo-acetylacetone only one complex of composition 1:1. This complex is reduced at the dropping mercury electrode in solutions of 0.1 M sodium sulphate giving a single irreversible diffusion controlled wave corresponding to two-electron reduction. The half-wave potential of this wave is pH dependent, both in non-buffered and in acetate buffer solutions, and shifts to more negative values by increasing the pH of the solution. The relation between copper concentration and the height of the wave of the complex is linear. An amperometric titration method was given for determining the concentration of copper ion in solution.
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