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- Properties
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Phosphorous acid is soluble in water and alcohol. It can be slowly oxidized to phosphoric acid in the air. When heated to 180 °C, it can be decomposed into phosphoric acid and phosphine (highly toxic). As a dibasic acid, it has slightly stronger acidity than phosphoric acid. Its strong reducibility enable it to easily reduce Ag+ to metal silver and sulfuric acid to sulfur. . It is corrosive, deliquescent and fairly hygroscopic. Phosphorous acid is widely used as the raw materials to produce phosphorous acid salt and plastic stabilizer in the plastic industry, and as reducer in chemical reaction. Phosphorous acid is also used in the synthetic fibre and pesticide industry etc.