nitrous acid


nitrous acid
an acid, HNO2, known only in solution.
[1670-80]

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      (HNO2), an unstable, weakly acidic compound that has been prepared only in the form of cold, dilute solutions. It is useful in chemistry in converting amines into diazonium compounds, which are used in making azo dyes. It is usually prepared by acidifying a solution of one of its salts, the nitrites, which are more stable (see nitrite).

      Nitrous acid decomposes into nitric oxide, NO, and nitric acid, HNO3. It may react as either an oxidizing or a reducing agent; that is, its nitrogen atom may either gain or lose electrons in reactions with other substances. Nitrous acid, for example, oxidizes iodide ion to elemental iodine but reduces bromine to bromide ion.

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Universalium. 2010.

Look at other dictionaries:

  • Nitrous acid — Preferred IUPAC name Nitrous acid …   Wikipedia

  • Nitrous acid — Nitrous Ni trous, a. [L. nitrosus full of natron: cf. F. nitreux. See {Niter}.] 1. Of, pertaining to, or containing, niter; of the quality of niter, or resembling it. [1913 Webster] 2. (Chem.) Of, pertaining to, or designating, any one of those… …   The Collaborative International Dictionary of English

  • nitrous acid — ► NOUN ▪ an unstable, weak acid made by the action of acids on nitrites …   English terms dictionary

  • nitrous acid — n. an acid, HNO2, known only in solution or in the form of its salts ( nitrites) …   English World dictionary

  • nitrous acid — nitrous acid. См. азотистая кислота. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • nitrous acid — HNO2; a standard biologic and clinical laboratory reagent. * * * nitrous acid n an unstable acid HNO2 known only in solution or in the form of its salts * * * ni·trous ac·id (niґtrəs) a weak acid, HNO2, existing only in aqueous solution …   Medical dictionary

  • nitrous acid — nitrito rūgštis statusas T sritis chemija formulė HNO₂ atitikmenys: angl. nitrous acid rus. азотистая кислота ryšiai: sinonimas – vandenilio dioksonitratas (1–) …   Chemijos terminų aiškinamasis žodynas

  • nitrous acid — noun an unstable inorganic acid known only in solution and as nitrite salts • Derivationally related forms: ↑nitrify • Hypernyms: ↑acid …   Useful english dictionary

  • nitrous acid — noun Date: 1788 an unstable acid HNO2 known only in solution or in the form of its salts or esters …   New Collegiate Dictionary

  • nitrous acid — noun A weak acid, HNO, known only in solution, or as its salts and esters, the nitrites; it has a linear structure, H O N=O …   Wiktionary


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