phosphoric anhydride

noun

Chemistry.

1. phosphorus pentoxide.

Word History and Origins

Origin of phosphoric anhydride¹

First recorded in 1875–80

Example Sentences

This compound on heating with phosphoric anhydride loses water and yields anthraquinone, It may be prepared in a similar manner by heating phthalyl chloride with benzene in the presence of aluminium chloride.

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Of the hygroscopic substances in common use, phosphoric anhydride, concentrated sulphuric acid, and dry potassium hydrate are almost equal in power; sodium hydrate and calcium chloride are not much behind.

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Carbonic anhydride and phosphoric anhydride may also be readily obtained in any desired quantity by slight alteration; but in case of phosphorus the air must be allowed to enter only gently, since a rapid current would at all times determine the fracture of the vessel.—Chem.

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Phosphoric anhydride, when heated to low redness, burns with a pale flame in fluorine, forming a gaseous mixture of fluorides and oxyfluoride of phosphorus.

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Sulphur 17.07 Manganese 30.31 Phosphoric anhydride 0.61 Iron 7.13 Bases 35.04 An analysis of an average sample gave: Per cent.

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