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单词 phosphorous acid
释义

phosphorous acid


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
Noun1.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


phos·phor·ous ac·id

(fos-fōr'us as'id), H3PO3; its salts are phosphites.

phosphorous acid

H3PO3, a crystalline acid formed when phosphorus is oxidized in moist air. CAS # 13598-36-2See also: acid

phosphorous acid


Related to phosphorous acid: hypophosphorous acid, metaphosphoric acid
  • noun

Synonyms for phosphorous acid

noun a clear or yellow monobasic acid (H3PO2)

Synonyms

  • hypophosphorous acid
  • orthophosphorous acid

Related Words

  • oxyacid
  • oxygen acid
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更新时间:2025/3/17 15:56:26