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phos'phorus pent•ox'ide



Pronunciation: (pen-tok'sīd, -sid), [key] Chem.
a white, deliquescent, crystalline powder, P2O5, that, depending upon the amount of water it absorbs, forms orthophosphoric acid, metaphosphoric acid, or pyrophosphoric acid, produced by the burning of phosphorus in dry air: used in the preparation of phosphoric acids, as a drying and dehydrating agent, and in organic synthesis. Also called phosphoric anhydride.

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

phosphorus 32phosphorus sesquisulfide

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