Abstract
WITHIN the last few years statements have appeared in various journals giving the PH values at which certain salts yield precipitates upon being rendered less acid. Some of these also record the lower limit of acidity at which precipitation is said to be complete. It accordingly appeared to be of interest to determine the form of the solubility curve. This was done for certain phosphates, using samples purchased as pure and washed with distilled water repeatedly to remove traces of more soluble phosphates, etc. The determinations were made at air temperature, about 10–12° C, upon solutions cleared by the centrifuge, using the curuleo-molybdate reaction of Deniges. Nine determinations were made upon a sample of tricalcic phosphate (B.P), between PH7.0 and PH5.1, hydrochloric acid being used to increase the acidity.
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ATKINS, W. Solubility of Phosphates in Relation to Hydrogen Ion Concentration. Nature 114, 275 (1924). https://doi.org/10.1038/114275a0
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DOI: https://doi.org/10.1038/114275a0
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