Abstract

In order to test further the applicability of the Debye-Hückel theory in describing solubility behavior at high temperatures, the solubility of calcium sulfate was determined in aqueous sodium nitrate and lithium nitrate solutions to 623 K. The solubilities are shown to adhere reasonably well to the extended Debye-Hückel theory at the experimental temperatures of 398 to 623 K to ionic strengths of 1 mol kg −1 , but with some divergences at higher ionic strengths. Comparative solubilities of calcium sulfate in water to 623 K are presented and discussed in an attempt to determine the correct values in water at zero ionic strength and at temperatures from 523 to 623 K.

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