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The solubility of calcium phosphates in citric acid

Published online by Cambridge University Press:  27 March 2009

A. A. Ramsay
A. A. Ramsay
Affiliation:
(Chemical Laboratory, Department of Agriculture, Sydney, N.S.W.)
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Extract

The results of these investigations show

1. The substances sold as “Phosphate of lime” and “Calcium Phosphas B.P.” are not pure tricalcic phosphate but are mixtures of di- and tricalcic phosphates.

2. Sodium phosphate (Na2HPO4) added to ammoniacal calcium chloride and the resulting precipitate washed with water yields a mixture of di- and tricalcic phosphate and calcium hydrate.

3. Bone ash dissolved in hydrochloric acid and precipitated with ammonia, the precipitate being well washed, yields also a mixture of di- and tricalcium phosphate and calcium hydrate.

4. When three equivalents of lime (3CaO) are made to act on one equivalent of phosphoric acid (P2O5) and the resulting precipitate removed with little delay pure tricalcium phosphate is obtained.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 8 , Issue 3 , June 1917 , pp. 277 - 298
Copyright
Copyright © Cambridge University Press 1917

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