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CAS Number :
13598-36-2
Synonym :
Phosphonic acid
Molecular Formula :
H₃PO₃
Phosphorous acid colorless deliquescent solid that can be prepared by the action of water on phosphorus( III) oxide or phosphorus(III) chloride. It is a dibasic acid producing the anions H2PO3- and HPO3 2- in water. The acid and its salts are slow reducing agents.