or'tho•phos•phor'ic ac'id

Pronunciation: (ôr'thō-fos-fôr'ik, -for'-, ôr"-), [key] Chem.
a colorless, crystalline solid, H3PO4, the tribasic acid of pentavalent phosphorus: used chiefly in fertilizers, as a source of phosphorus salts, and in soft drinks as an acidulant and flavoring agent.

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

orthophosphateorthophosphorous acid
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