Calcium Biphosphate Solution

Calcium biphosphate dissolves in much water, apparently without decomposition with a small quantity of water, an amorphous salt separates, richer in calcium, while the solution exhibits a strongly acid reaction. 

On heating a 1 20 aqueous solution of calcium biphosphate to boiling, a precipitate forms. 

Arsenic. —Introduce 10 gm. of arsenic-free, granulated zinc into the generating flask of a Marsh apparatus, and start the stream of hydrogen by adding dilute (1 5) sulphuric acid. After the apparatus and reagents have been tested in the usual manner, dissolve 2 gm. of calcium biphosphate in 5 cc. of hydrochloric acid and 15 cc. of water. Introduce this solution into the Marsh apparatus, and maintain the flow of gas for about one hour. No deposit of arsenic should be visible in the reduction tube within this time. 

Chlorides. — A solution of 1 gm. of calcium biphosphate in 5 cc. of nitric acid and 15 cc. of water should not be rendered more than slightly opalescent on the addition of silver nitrate solution. 

CALCIUM BIPHOSPHATE (7758-87-4 10103-46-5) Ca3(P04)2 Noncombustible solid. Mixture with water produces acid solution attacks metals, forming flammable hydrogen gas. 

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See also in sourсe #XX -- [ ]

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