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This article in SSSAJ

  1. Vol. 26 No. 1, p. 48-51
    Received: Mar 15, 1961
    Accepted: Aug 24, 1961

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The Solubility of Some Strontium Phosphates1

  1. Maurice H. Frere2



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 Ksp of SrHPO4 is 4.2 × 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.

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