Pyrophosphoric acid

Pyrophosphoric

White to light yellow solid

Fixed

61 ° C

Very well in water ( 7090 g · l-1 at 23 ° C)

Risk

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Diphosphonic acid (also pyrophosphoric acid ) is an oxoacid of phosphorus and is one of the inorganic acids. It is derived from phosphoric acid and can be represented as a superposition of two phosphoric acid molecules together with elimination of water.

Diphosphonic acid is highly hygroscopic and a moderately strong inorganic acid. With water diphosphonic acid hydrolyzed exothermically to form phosphoric acid.

The salts and esters of pyrophosphoric acid are called pyrophosphates or diphosphates.

Production and representation

Diphosphonic acid is prepared according to the above formula by dehydration of phosphoric acid at 200-300 ° C. Pure di-phosphoric acid produced from phosphoric acid and phosphorus oxychloride: