Phosphorous Acid

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phosphorous acid [′fäs·fə·rəs ′as·əd]

(inorganic chemistry)

H₃PO₃Alcohol- and water-soluble deliquescent white or yellowish crystals; decomposes at 200°C; used as an analytical reagent and reducing agent.

Phosphorous Acid

H₃PO₃, a weak dibasic acid. Anhydrous phosphorous acid occurs as colorless hygroscopic crystals with a density of 1.65 g/cm³ and a melting point of 70.1°C. The dissociation constants at 18°C are K₁ = 5.1 × 10^–2 and K₂ = 1.8 × 10^–7. The solubility at 20°C is approximately 80 percent. When heated to 250°C, anhydrous phosphorous acid decomposes into phosphoric acid and phosphine; its aqueous solutions decompose at this temperature into phosphoric acid and hydrogen. Phosphorous acid is readily oxidized by such agents as halogens and the oxides of nitrogen. It is produced by dissolving P₄O₆ (P₂O₃) in cold water, by hydrolyzing PC1₃, and by reacting phosphites with sulfuric acid. Phosphorous acid and its salts are used as reducing agents.

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