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Reference.org
Phosphite (ion)
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<p>A phosphite ion in inorganic chemistry usually refers to [HPO3]2− but includes [H2PO3]− . These anions are the conjugate bases of <a href="/facts/Phosphorous_acid/4A4bHBTw">phosphorous acid</a> (H3PO3). The corresponding salts, e.g. <a href="/facts/Sodium_phosphite/9QXF4c2S">sodium phosphite</a> (Na2HPO3) are reducing in character. </p>