Usual methods of physical chemistry have been applied to the calculation of the solubility of sulphides up to 400 degrees C. Results for ZnS, PbS, HgS, CuS, Ag 2 S, and Cu 2 S, indicate a considerable increase of the solubility with temperature, the ratio solubility at 400 degrees / solubility at 25 degrees ranging from IO 2 to IO 4 , and reaching even IO 7 for zinc sulphide. The order of increasing solubility remains practically the same at 400 degrees as at 25 degrees . A convenient formula has been developed, giving changes of solubility with acidity.

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