phosphorous acid

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Related to orthophosphorous acid: H3PO3

phos·phor·ous ac·id

(fos-fōr'us as'id),
H3PO3; its salts are phosphites.

phosphorous acid

H3PO3, a crystalline acid formed when phosphorus is oxidized in moist air.
CAS # 13598-36-2
See also: acid