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Ferrous dihydrogen orthophosphate, Fe(H2PO4)2

Ferrous dihydrogen orthophosphate, Fe(H2PO4)2.2H2O. is obtained by dissolving iron in excess of phosphoric acid solution in a current of hydrogen gas. Excess of acid is removed by washing with ether, and the substance dried in hydrogen. Obtained in this way the salt is a white, crystalline powder, which readily oxidises in air, yielding a ferric salt. It is insoluble in alcohol, but readily dissolves in water.

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