Aqueous Solubilities, Solubility Products and Standard Oxidation‐Reduction Potentials of the Metal Sulfides

1 December 1988

journal article
Published by The Electrochemical Society in Journal of the Electrochemical Society

Vol. 135 (12) , 2971-2975
https://doi.org/10.1149/1.2095471

Abstract

Available thermodynamic data, incorporating a new free energy of formation for aqueous S²⁻ of 111 (±2) kJ/mol at 25°C, indicate that solubility products of the insoluble metal sulfide salts are several orders of magnitude smaller than previously considered. Thermodynamic characterization for a variety of soluble and insoluble aqueous metal sulfide systems is reported. Trends in the aqueous solubilities of the alkali salts solubilities are compared and discussed. New aqueous solubility products, , and standard redox potentials, , for over forty metal sulfides are determined. The new values of and at 25°C include: , and . Significant free S²⁻ occurs only in extremely alkaline media. The suitability of , rather than , based solubility products and redox potentials is discussed and these alternate values determined.

Keywords

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