- About Phosphorous acid 
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Phosphorous acidProduct Name: Phosphorous acidSynonyms:6522 Phosphonic acid; hydrogen phosphonate; phosphorus(+3) trihydride cation trihydroxide; Orthophosphorus; Orthophosphorous acid; Ortho-Phosphorous acidCAS RN.: 13598-36-2EINECS: 237-066-7 Molecular Weight: 81.9957 Molecular Formula: H3PO3 Melting Point(℃): 73℃ Water Solubility: SOLUBLE Hazard Symbols: C Details Risk Codes: R22;R35; Details Safety Description: S26;S36/37/39;S45; Details   
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