A phosphite anion or phosphite in inorganic chemistry usually refers to [HPO3]2−but includes [H2PO3]− ([HPO2(OH)]−). These anions are the conjugate bases of phosphorous acid (H3PO3). The corresponding salts, e.g. sodium phosphite(Na2HPO3) are reducing in character.
https://en.wikipedia.org/wiki/Phosphite_anion
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