ortho phosphorous acid

orthophosphorous acid

[awr-thuh-fos-fer-uhs, awr-thoh-fos-fawr-uhs, -fohr-]
noun Chemistry.
a white to yellowish, crystalline, hygroscopic, water-soluble solid, H 3 PO 3 , used chiefly in the synthesis of phosphites.
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World English Dictionary
orthophosphorous acid (ˌɔːθəʊˈfɒsfərəs)
Also called: phosphorous acid a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3

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