Sometimes the minor tautomer is called hypophosphorous acid and the major tautomer is called phosphinic acid. HOP(O)H 2 exists in equilibrium with the minor tautomer HP(OH) 2. Salts derived from this acid are called hypophosphites. The formula for hypophosphorous acid is generally written H 3PO 2, but a more descriptive presentation is HOP(O)H 2 which highlights its monoprotic character. It is a colorless low-melting compound, which is soluble in water, dioxane, and alcohols. Inorganic chemists refer to the free acid by this name (also as "HPA") although its official IUPAC name is phosphinic acid. Hypophosphorous acid is a phosphorus oxoacid and a powerful reducing agent. Sodium hypophosphite Barium hypophosphiteĮxcept where noted otherwise, data are given for materials in their standard state (at 25 ☌, 100 kPa) Infobox disclaimer and references
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