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The Solubility of Some Strontium Phosphates¹

ABSTRACT

Strontium phosphate precipitates were formed by mixing different amounts of Sr(OH)₂ and H₃PO₄. A solubility diagram was prepared from the analysis of the supernatant in equilibrium with the precipitate. X-ray diffraction patterns indicated that there were two compounds, SrHPO₄ and Sr₁₀(PO)₆(OH)₂. From the solubility diagram, it is estimated that the K_sp of SrHPO₄ is 4.2 x 10^-7. The observed slope of the hydroxyaptite line was different than the theoretical line and it was postulated that change in slope is due to the different solubilities of different sized crystals. Calculations show that size differences between crystals sufficient to give the observed solubility differences could be too small to be detected by an electron microscope.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, Beltsville, Md.

² Soil Scientist, ARS. USDA, Beltsville, Md.

Received for publication March 15, 1961. Accepted for publication August 24, 1961.