Abstract
The saturation curve for synthetic α-hopeite, Zn 3(PO 4) 2·4H 2O in dilute phosphoric acid solutions has been determined at 25°C as a function of pH. Interpretation of the data in terms of a model which assumes the formation of the ion-pairs ZnHPO 4 0 and ZnH 2PO 4 + in these solutions resulted in the solubility product constant for α-hopeite of 10 −35.3±0.1. The data show that the formation of hopeite may influence both the availability of zinc in soils and the zinc levels in natural water systems.
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