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CAS No 7782-77-6 , nitrous acid

  • Name: nitrous acid
  • Synonyms: nitrous acid; AG-H-11785; HNO2;Nitrosyl hydroxide; CHEBI:25567; dioxonitric acid; EINECS 231-963-7; Kyselina dusite; Kyselina dusite [Czech]; 7782-77-6;
  • CAS Registry Number:
  • Safety Statements: Mutation data reported. Flammable by chemical reaction; a powerful oxidizer. Explodes on contact with phosphorus trichloride. Reacts violently with PH3 and PCl3. Reactions with 1-amino-5-nitrophenol, ammonium decahydroborate(2−), hydrazine (product is hydrogen azide) may give explosive products. Incompatible with anilines (e.g., 4-bromoaniline, 2-chloroaniline, 3-chloroaniline, 2-nitroaniline, 3-nitroaniline, 4-nitroaniline, aniline), semicarbazone, silver nitrate. When heated to decomposition it emits highly toxic fumes of NOx. See also NITRIC OXIDE.
  • EINECS: 231-963-7
  • Molecular Weight: 47.01344
  • InchiKey: IOVCWXUNBOPUCH-UHFFFAOYSA-N
  • InChI: InChI=1S/HNO2/c2-1-3/h(H,2,3)
  • Molecular Formula: HNO2
  • Molecular Structure:CAS No:7782-77-6 nitrous acid

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References of nitrous acid
Title: Nitrous Acid
CAS Registry Number: 7782-77-6
Molecular Formula: HNO2
Molecular Weight: 47.01
Percent Composition: H 2.14%, N 29.80%, O 68.07%
Literature References: Formed by the action of strong acids on inorganic nitrites. Review: Block, "Nitrous Acid, Hyponitrous Acid and their Salts" in Mellor's Vol. VIII, supplement II, Nitrogen (part 2) 353-408 (1967).
Properties: Known only in soln (pale blue in color). Weak acid. pK (25°) 3.35. In water it changes quickly into nitric oxide and nitric acid. Forms stable, water-sol nitrites with Li, Na, K, Ca, Sr, Ba, Ag. Does not form salts with weak polyvalent cations like Al or Be. Forms stable esters with alcohols.
pKa: pK (25°) 3.35