Dithionic acid


Dithionic acid
Dithionic acid
Ball-and-stick model of dithionic acid
Identifiers
CAS number 14970-71-9
PubChem 26985
ChemSpider 25128 YesY
ChEBI CHEBI:29208 YesY
Jmol-3D images Image 1
Properties
Molecular formula H2S2O6
Molar mass 162.14 g mol−1
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Dithionic acid, H2S2O6, is a chemical compound known only in solution[2].

Salts

Dithionic acid is dibasic and salts called dithionates are known. No acid salts have been discovered. All dithionates are readily soluble in water[2]. They are mild oxidizing and mild reducing agents. The structure of dithionate ion is like ethane, but two SO3 groups adopt an almost eclipsed conformation. The S—S length is 2.15 Å; S—O bonds are rather short with bond length of 1.43 Å.

Synthesis

Dithionates can be made by oxidizing a sulfite (from the +4 to the +5 oxidation state), but on a larger scale they are made by oxidizing a cooled aqueous solution of sulfur dioxide with MnO2:

2MnO2 + 3SO2 → MnS2O6 + MnSO4

The manganese dithionate solution formed can then be converted to dithionate salts of other metals by metathesis reactions:

Ba2+(aq) + MnS2O6(aq) + MnSO4(aq) → BaSO4(s)↓ + BaS2O6·2H2O(aq)

Concentrated solutions of dithionic acid can subsequently be obtained treating a barium dithionate solution with sulfuric acid:

BaS2O6(aq) + H2SO4(aq) → H2S2O6(aq) + BaSO4(s)↓

References

  1. ^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSCIUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.
  2. ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN 0080379419.  pp. 715-716

www.chemindustry.com/chemicals/1022920.html - CASNo reference


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Look at other dictionaries:

  • Dithionic acid — Dithionic Di thi*on ic, a. [Pref. di + thionic.] (Chem.) Containing two equivalents of sulphur; as, dithionic acid. [1913 Webster] {Dithionic acid} (Chem.), an unstable substance, {H2S2O6}, known only in its solutions, and in certain well defined …   The Collaborative International Dictionary of English

  • dithionic acid — [dī΄thī än′ik] n. [ DI 1 + THIONIC] an acid, H2S2O6, having two sulfur atoms in each molecule and existing only in salts or solutions …   English World dictionary

  • dithionic acid — Hyposulphuric Hy po*sul*phur ic, a. [Pref. hypo + sulphuric.] (Chem.) Pertaining to, or containing, sulphur in a lower state of oxidation than in the sulphuric compounds; as, hyposulphuric acid. [1913 Webster] {Hyposulphuric acid}, an acid,… …   The Collaborative International Dictionary of English

  • dithionic acid — ditionato rūgštis statusas T sritis chemija formulė H₂S₂O₆ atitikmenys: angl. dithionic acid rus. дитионовая кислота ryšiai: sinonimas – vandenilio heksaoksodisulfatas (S–S)(2–) …   Chemijos terminų aiškinamasis žodynas

  • dithionic acid — |dī+... noun Etymology: International Scientific Vocabulary di + thionic : a strong dibasic acid H2S2O6 made by oxidizing sulfurous acid but known only in solution and in the form of salts * * * Chem. a strong, unstable acid, H2S2O6, known only… …   Useful english dictionary

  • dithionic acid — Chem. a strong, unstable acid, H2S2O6, known only in solution and in the form of its salts. [1850 55] * * * …   Universalium

  • dithionic acid — /daɪˌθaɪənɪk ˈæsəd/ (say duy.thuyuhnik asuhd) noun a moderately strong, stable acid, H2S2O6 …   Australian English dictionary

  • Dithionic — Di thi*on ic, a. [Pref. di + thionic.] (Chem.) Containing two equivalents of sulphur; as, dithionic acid. [1913 Webster] {Dithionic acid} (Chem.), an unstable substance, {H2S2O6}, known only in its solutions, and in certain well defined salts.… …   The Collaborative International Dictionary of English

  • dithionic — /duy thuy on ik, dith ee /, adj. Chem. of or derived from dithionic acid. [1850 55; DI 1 + THIONIC] * * * …   Universalium

  • dithionic — /duy thuy on ik, dith ee /, adj. Chem. of or derived from dithionic acid. [1850 55; DI 1 + THIONIC] …   Useful english dictionary


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