Abstract
MUCH research has been devoted to the solubility of hydroxyapatite, Ca10(PO4)6(OH)2, and a large number of solubility constants have been reported. They are, however, inconsistent and, according to van Wazer1, vary over a range of 1011. A complicating factor seems to be the presence of small quantities of carbonate; thus Greenwald2 and Ericsson3 found that in the absence of carbonate the solubility of hydroxyapatite obeyed the solubility product principle, but it did not obey this principle in the presence of carbonate ions. Greenwald attributed the increase of solubility in the presence of carbonate ions at high pH to the formation of complex ions in the solution, but this reaction would not account for the decrease in solubility found by Ericsson at low pH.
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