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The Solubility of Some Strontium Phosphates
Author(s) -
Frere Maurice H.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600010013x
Subject(s) - solubility , strontium , diagram , solubility equilibrium , phosphate , scanning electron microscope , mixing (physics) , chemistry , diffraction , mineralogy , materials science , crystallography , analytical chemistry (journal) , chromatography , organic chemistry , physics , optics , composite material , mathematics , statistics , quantum mechanics
Strontium phosphate precipitates were formed by mixing different amounts of Sr(OH) 2 and H 3 PO 4 . 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, SrHPO 4 and Sr 10 (PO) 6 (OH) 2 . From the solubility diagram, it is estimated that the K sp of SrHPO 4 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.