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Problems Associated with the Determination and Application of the Solubility Product Constant¹

ABSTRACT

Difficulties encountered in estimating the solubility product constants of CaSO₄ · 2H₂O and CaCO₃ from analytical measurements are discussed. A major factor involved is the formation of complexes between the constituent of the dissolving solid and other ionic species in solution. Conversely, when the solubility product principle using these constants is applied for predicting the precipitation of ions or the dissolution of a solid in fairly dilute solutions containing various ionic constituents, adequate accounting of all possible combinations of ion association must be made. Prediction problems are still present for solutions at high salt concentrations.

¹ Contribution of the ARS, Soil & Water Conserv. Res. Div., USDA. Presented before Div. S-2, Soil Science Society of America, Tucson, Ariz., Aug. 25, 1970.

² Research Chemist, US Water Conservation Laboratory, 4331 East Broadway, Phoenix, Ariz. 85040.

Received for publication November 17, 1970. Accepted for publication January 14, 1971.