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1 the tetravalent anion, P2O74−, derived from diphosphoric acid (earlier known as pyrophosphoric acid), heptaoxodiphosphoric(v) acid, (HO)2PO−O−PO(OH)2.

2 any mixture of free diphosphoric acid and its anions. See also inorganic diphosphate, pyrophosphate.


Subjects: Chemistry.

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