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phosphorous acid

noun, Chemistry
1.
a colorless, crystalline, water-soluble acid of phosphorus, H 3 PO 3 , from which phosphites are derived.
Origin
1785-1795
1785-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for phosphorous acid
  • In other areas phosphorous acid is still recommended.
  • The third group includes phosphorous acid-containing products.
  • These are the first reported data concerning the physical mode of action of phosphorous acid against downy mildew.
British Dictionary definitions for phosphorous acid

phosphorous acid

noun
1.
Also called orthophosphorous acid. a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3 Systematic name phosphoric acid
2.
any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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phosphorous acid in Science
phosphorous acid
  (fŏs'fər-əs, fŏs-fôr'əs)   
A white or yellowish crystalline solid used as a reducing agent. It is hygroscopic (easily absorbs moisture from the atmosphere). Chemical formula: H3PO3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for phosphorous 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.

Learn more about phosphorous acid with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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