Sulfurous acid

Sulfurous acid

Chembox new
Name = Sulfurous acid
ImageFile = Sulfurous-acid-2D-pyramidal.png ImageSize = 150px
ImageName = Sulfurous acid
ImageFile1 = Sulfurous-acid-3D-balls.png ImageSize1 = 200px
ImageName1 = Ball-and-stick model fo sulfurous acid
IUPACName = Sulfurous acid
Section2 = Chembox Properties
Formula = H2SO3 (aq)
MolarMass = 82.07 g/mol

Sulfurous acid is the chemical compound with the formula H2SO3. There is no evidence that sulfurous acid exists in solution, but the molecule has been detected in the gas phase. [cite journal | author = D. Sülzle, M. Verhoeven, J. K. Terlouw, H. Schwarz | title = Generation and Characterization of Sulfurous Acid (H2SO3) and of Its Radical Cation as Stable Species in the Gas Phase | journal = Angew. Chem. Int. Ed. Engl. | volume = 27 | pages = 1533–4 | year = =1988 | doi = 10.1002/anie.198815331] The conjugate bases of this elusive acid are, however, common anions, bisulfite (or hydrogensulfite) and sulfite.

Raman spectra of solutions of sulfur dioxide in water show only signals due to the SO2 molecule and the bisulfite ion, HSO3−.Fact|date=October 2007 The intensities of the signals are consistent with the following equilibrium:

::SO2 + H2O unicode|⇌ HSO3− + H+:::"K"a = 1.54 × 10−2 dm3 mol−1; p"K"a = 1.81.

Aqueous solutions of sulfur dioxide, which sometimes are referred to as sulfurous acid are used as reducing agents and as disinfectants, as are solutions of bisulfite and sulfite salts. They are also mild bleaches, and are used for materials which may be damaged by chlorine-containing bleaches.

References

ee also

*Sulfite
*Sulfuric acid
*Bisulfite
*Carbonic acid, another hypothetical acid used to represent a dissolved gas


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Look at other dictionaries:

  • sulfurous acid — n. a colorless acid, H2SO3, known only in the form of its salts or in aqueous solution and used as a chemical reagent, a bleach, in medicine, etc …   English World dictionary

  • sulfurous acid — A solution of about 6% sulfur dioxide in water; used chiefly as a disinfectant and bleaching agent; it has been used externally for its parasiticidal effect in various skin diseases. * * * sulfurous acid n a weak unstable dibasic acid H2SO3 …   Medical dictionary

  • sulfurous acid — sulfito rūgštis statusas T sritis chemija formulė H₂SO₃ atitikmenys: angl. sulfurous acid rus. сернистая кислота ryšiai: sinonimas – vandenilio trioksosulfatas (2–) …   Chemijos terminų aiškinamasis žodynas

  • sulfurous acid — noun 1. : sulfur dioxide 2. : an unstable weak dibasic acid H2SO3 that is known especially in solutions of sulfur dioxide in water and in the form of its salts and that is a good reducing and bleaching agent forming sulfuric acid as it is… …   Useful english dictionary

  • sulfurous acid — noun Date: 1790 a weak unstable dibasic acid H2SO3 known in solution and through its salts and used as a reducing and bleaching agent …   New Collegiate Dictionary

  • sulfurous acid — noun The weak acid, HSO, present in a solution of sulfur dioxide in water; it is a reducing agent and mild bleach. See Also: sulfite, bisulfite …   Wiktionary

  • sulfurous acid anhydride — noun see sulfurous anhydride …   Useful english dictionary

  • sulfurous acid — Chem. a colorless liquid, H2SO3, having a suffocating odor, obtained by dissolving sulfur dioxide in water, known mainly by its salts, which are sulfites: used chiefly in organic synthesis and as a bleach. [1780 90] * * * …   Universalium

  • sulfurous acid — sul′furous ac′id n. chem. a colorless liquid, H2SO3, having a suffocating odor, used chiefly in organic synthesis and as a bleach • Etymology: 1780–90 …   From formal English to slang

  • acid halide — ▪ chemical compound       neutral compound that reacts with water to produce an acid and a hydrogen halide. Acid halides are ordinarily derived from acids or their salts by replacement of hydroxyl groups by halogen atoms. The most important… …   Universalium

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