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phosphor'ic ac'id



Chem.
any of three acids, orthophosphoric acid, H3PO4, metaphosphoric acid, HPO3, or pyrophosphoric acid, H4P2O7, derived from phosphorus pentoxide, P2O5, and various amounts of water.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

phosphoricphosphorism
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