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Determination of the Solubility Product of Soil Constitutents Such as Gypsum¹

ABSTRACT

The solubility product of gypsum at 20C was calculated using a converging cyclic procedure which involved the use of a published value for the dissociation constant of gypsum, an experimentally determined value for total Ca concentration, and the second approximation of the Debye-Hückel equation.

Total Ca concentration of filtered saturated extracts was determined using atomic absorption spectroscopy.

From this method the solubility product of CaSO₄ at 20C was found to be 2.46 x 10^-5 and 32.1% of total soluble Ca was found to be present as ion pairs.

¹ Department of Soil Science, University of Sydney, Sydney, Australia.

² Senior Tutor Demonstrator, and Senior Lecturer in Soil Science, respectively.

Received for publication March 25, 1968. Accepted for publication April 9, 1968.