Solubility Product of Magnesium Ammonium Phosphate Hexahydrate at Various Temperatures

Abstract
The solubility of magnesium ammonium phosphate hexahydrate (MgNH4PO4 .cntdot. 6H2O) was determined in aqueous solution at 25.degree., 35.degree., 38.degree. and 45.degree. C. The thermodynamic solubility product was determined at each temperature. [Magnesium ammonium phospahte hexahydrate (MgNH4-PO4 .cntdot. 6H2O, struvite) is found in .apprx. 16% of [human] urinary calculi.].