phosphorous acid

phosphorous acid
a colorless, crystalline, water-soluble acid of phosphorus, H3PO3, from which phosphites are derived.
[1785-95]

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(H3PO3),also called  Orthophosphorous Acid,  

      one of several oxygen acids of phosphorus, used as reducing agent in chemical analysis. It is a colourless or yellowish crystalline substance (melting point about 73° C, or 163° F) with a garliclike taste. An unstable compound that readily absorbs moisture, it is converted to phosphoric acid (H3PO4) in the presence of oxygen or when heated above 180° C (360° F). Phosphorous acid (H3PO3) forms salts called phosphites, also used as reducing agents. It is prepared by dissolving tetraphosphorus hexoxide (P4O6) or phosphorus trichloride (PCl3) in water.

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Universalium. 2010.

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Look at other dictionaries:

  • phosphorous acid — n. a white or yellowish, crystalline acid, H3PO3, that absorbs oxygen readily: used as a chemical reducing agent and as an analytical reagent …   English World dictionary

  • Phosphorous acid — Chembox new ImageFile = Phosphonic acid 3D balls A.png ImageSize = 150px ImageName = Phosphonic acid ImageFile1 = Phosphonic acid 2D dimensions.png ImageSize1 = 150px ImageName1 = Phosphonic acid IUPACName = phosphonic acid… …   Wikipedia

  • phosphorous acid — H3PO3; its salts are phosphites. * * * phosphorous acid n a deliquescent crystalline acid H3PO3 used esp. as a reducing agent and in making phosphites * * * phos·pho·rous ac·id (fos forґəs) a reducing inorganic acid, H3PO3, which readily… …   Medical dictionary

  • phosphorous acid — fosfito rūgštys statusas T sritis chemija apibrėžtis Fosfono rūgšties tautomeras. formulė P(OH)₃ atitikmenys: angl. phosphorous acid rus. фосфористая кислота …   Chemijos terminų aiškinamasis žodynas

  • phosphorous acid — fosfito rūgštys statusas T sritis chemija formulė H₂PHO₃ atitikmenys: angl. phosphorous acid rus. фосфористая кислота ryšiai: sinonimas – vandenilio hidridotrioksofosfatas (2–) …   Chemijos terminų aiškinamasis žodynas

  • phosphorous acid — noun a clear or yellow monobasic acid (H3PO2) • Syn: ↑hypophosphorous acid, ↑orthophosphorous acid • Hypernyms: ↑oxyacid, ↑oxygen acid …   Useful english dictionary

  • phosphorous acid — noun Date: 1788 a deliquescent crystalline acid H3PO3 used especially as a reducing agent and in making phosphites …   New Collegiate Dictionary

  • phosphorous acid — phospho′rous ac′id n. chem. a colorless, crystalline, water soluble acid of phosphorus, H3PO3, from which phosphites are derived • Etymology: 1785–95 …   From formal English to slang

  • phosphorous acid — /fɒsfərəs ˈæsəd/ (say fosfuhruhs asuhd) noun a colourless, water soluble, crystalline acid of phosphorus, H3PO3, from which phosphites are derived …  

  • phosphorous acid — noun a yellowish hygroscopic solid, HPO; a mild reducing agent See Also: phosphite …   Wiktionary

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