Abstract:

This article studied the electromotive force and free energy change of the reaction that copper is trans- formed into cupric subcarbonate under different pH, humidity, and water states. The size of the pH value has no effect on spontaneity in the acidic pH; when atmospheric carbon dioxide reaches the saturation value and air humidity increases, the spontaneity of reaction increases slightly; when water changes from gaseous into liquid under the same conditions, the spontaneity of reaction increases.

Key words: Cupric subcarbonate, Humidity, Electromotive force, Gibbs free energy