Abstract

The dissolution of calcium sulfate dihydrate crystals into subsaturated solutions of the salt has been studied at various temperatures between 10° and 30°C using a calcium ion electrode. The process follows an equation first order in relative subsaturation and is sensitive to changes in the rate of stirring indicating film diffusion control. The rate of dissolution is considerably faster than that for barium, strontium and lead sulfates for which a surface controlled reaction has been suggested. The activation energy for dissolution of CaSO 4·2H 2O is 10 ± 1·5 kcal/mole.

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