Phosphorus pentoxide is a chemical compound with molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). This white crystalline solid is the anhydride of phosphoric acid. It is a powerful desiccant and dehydrating agent.
P 7379 (OTTO) Phosphorous pentoxide, powder, ACS reagent, 99% Cas 1314-56-3 - used as a dessicant for bacterial cultural extracts analyzed by gas-liquid chromatography.