phosphorous acid

n. A white or yellowish hygroscopic crystalline solid, H₃PO₃, used as a reducing agent and to produce phosphite salts.

phosphorous acid

n 1. (Elements & Compounds) Also called: orthophosphorous acid a white or yellowish hygroscopic crystalline dibasic acid. Formula: H3PO3. Systematic name: phosphoric acid 2. (Elements & Compounds) any oxyacid of phosphorus containing less oxygen than the corresponding phosphoric acid

phospho′rous ac′id

n. a colorless, crystalline, water-soluble acid of phosphorus, H₃PO₃, from which phosphites are derived. [1785–95]

Thesaurus

Noun

phosphorous acid - a clear or yellow monobasic acid (H3PO2)hypophosphorous acid, orthophosphorous acidoxyacid, oxygen acid - any acid that contains oxygen

Phosphorous Acid

phosphorous acid

[′fäs·fə·rəs ′as·əd] (inorganic chemistry) H₃PO₃ Alcohol- 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.

phosphorous acid

phosphorous acid

phosphorous acid

phospho′rous ac′id

Phosphorous Acid

phosphorous acid

Phosphorous Acid

phosphorous acid

phos·phor·ous ac·id

phosphorous acid

phosphorous acid

Synonyms for phosphorous acid

noun a clear or yellow monobasic acid (H3PO2)

Synonyms

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