Tags: Chemical Compound, Chemical Substance.
A phosphite in inorganic chemistry is a salt of phosphorous acid H3PO3 and following the IUPAC naming recommendations the phosphite ion would be PO33− a salt of P(OH)3.Historically phosphite has referred to salts containing HPO32− and this is because aqueous H3PO3 is not triprotic P(OH)3 but almost exclusively the diprotic HP(O)(OH)2 (IUPAC recommended name of phosphonic acid). The IUPAC recommended name for the HPO32− ion is phosphonate and this naming convention is becoming more common.
