Abstract
The anodic oxidation of copper in a variety of aqueous electrolytes has been investigated. In the presence of agents (e.g. CN −, Cl −, S 2O 3 =) which form stable complexes with copper(I), the metal enters solution solely in the unipositive state over a wide concentration range of electrolyte. With a nitrate, sulphate, or chlorate as electrolyte, copper enters solution with an apparent valence number considerably greater than 1 at 25°C. However, as the temperature is increased, the apparent valence number of copper decreases in the presence of these anions. With chlorate at 98°C, the valence number of copper falls to 1. All the experimental data can be explained on the hypothesis that the primary electrode reaction consists of the formation of unipositive copper.
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