Pyrophosphoric Acid Definition
pīrō-fŏs-fôrĭk
noun
A viscous liquid acid, H4P2O7, which crystallizes when left standing at ordinary temperatures and is easily converted to orthophosphoric acid upon dilution with water.
Webster's New World
A syrupy liquid formed by the dehydration of phosphoric acid; its salts, the pyrophosphates, are used in medicine.
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