Pyrophosphoric acid
WordNet
noun
(1) A solid acid formed by reactions of orthophosphoric acid
WiktionaryText
Noun
- A syrupy liquid formed by the dehydration of phosphoric acid; its salts, the pyrophosphates, are used in medicine.
- The acid formed by removing a molecule of water from two molecules of phosphoric acid, H4P2O7; this reaction slowly reverses in the presence of water.