dithionic acid

Dithionic acid
Names
	IUPAC name dithionic acid
	Other names hypodisulfuric acid
Identifiers
CAS Number	14970-71-9
3D model (Jmol)	Interactive image
ChEBI	CHEBI:29208
ChemSpider	25128
PubChem	26985
	InChI InChI=1S/H2O6S2/c1-7(2,3)8(4,5)6/h(H,1,2,3)(H,4,5,6) Key: RMGVZKRVHHSUIM-UHFFFAOYSA-N ; InChI=1/H2O6S2/c1-7(2,3)8(4,5)6/h(H,1,2,3)(H,4,5,6) Key: RMGVZKRVHHSUIM-UHFFFAOYAM ;
	SMILES O=S(=O)(O)S(=O)(=O)O ;
Properties
Chemical formula	H2S2O6
Molar mass	162.14 g mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

二チオン酸

WordNet

street name for lysergic acid diethylamide (同)back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen
any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
having the characteristics of an acid; "an acid reaction"

PrepTutorEJDIC

酸性の / 酸味のある,すっぱい(sour) / (言葉・態度などが)厳しい,しんらつな / 酸 / すっぱいもの / 《俗》=LSD

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/12/15 14:58:04」(JST)

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[Wiki en表示]

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

^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.
^ ^a ^b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9. pp. 715-716

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

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English Journal

Sensitive determination of anions in saliva using capillary electrophoresis after transient isotachophoretic preconcentration.

Xu Z, Doi T, Timerbaev AR, Hirokawa T.Author information Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama 1, Higashi-hiroshima 739-8527, Japan.AbstractA transient isotachophoresis-capillary electrophoresis (tITP-CE) system for the determination of minor inorganic anions in saliva is described. The complete separation and quantification of bromide, iodide, nitrate, nitrite, and thiocyanate has been achieved with only centrifugation and dilution of the saliva sample. In-line tITP preconcentration conditions, created by introduction of the plugs of 5 mM dithionic acid (leading electrolyte) and 10 mM formic acid (terminating electrolyte) before and after the sample zone, respectively, allowed the limits of direct UV absorption detection (at 200 nm) to be up to 50-fold improved as compared with CE without tITP. As a result, nitrate and thiocyanate were still detectable at 4.6 and 3.8 microgl(-1), respectively, in 1000 times diluted saliva. The daily variations of anionic concentrations in saliva samples taken from a smoking health volunteer were discussed based on the results of tITP-CE analysis. It was confirmed that the thiocyanate concentration in saliva noticeably increased after smoking. This is apparently the first report on simultaneous quantification of more than four anionic salivary constituents using CE.
Talanta.Talanta.2008 Oct 19;77(1):278-81. doi: 10.1016/j.talanta.2008.06.017. Epub 2008 Jun 22.
A transient isotachophoresis-capillary electrophoresis (tITP-CE) system for the determination of minor inorganic anions in saliva is described. The complete separation and quantification of bromide, iodide, nitrate, nitrite, and thiocyanate has been achieved with only centrifugation and dilution of
PMID 18804633

New leading electrolyte for the direct determination of chloride and other anions in analytical isotachophoresis.

Meissner T, Eisenbeiss F, Jastorff B.Author information Merck KGaA, Darmstadt, Germany.AbstractIn a number of experiments it was shown that the dithionate ion possesses a higher effective mobility than the chloride ion in aqueous solution, thus enabling the direct and simultaneous isotachophoretic determination of chloride and other anions. Using an acid-base titration, we found only one pKa value for dithionic acid, which is in contrast to the two pKa values stated in the literature. Based on this pKa value, theoretical calculations and the experimentally observed effective mobility of the dithionate ion indicate a higher effective mobility compared to the chloride ion from pH 3. Taking into account the physico-chemical properties of the dithionate, its unrestricted use as isotachophoretic leading ion was confirmed. Based on the dithionate ion, new electrolyte systems for the determination of chloride were used. One system was optimised for the determination of chloride and other low-molecular-mass anions and applied to the analysis of waste water and drinking water. The water samples were analysed in parallel by ion chromatography and compared with the isotachophoretic results.
Journal of chromatography. A.J Chromatogr A.1999 Apr 9;838(1-2):81-8.
In a number of experiments it was shown that the dithionate ion possesses a higher effective mobility than the chloride ion in aqueous solution, thus enabling the direct and simultaneous isotachophoretic determination of chloride and other anions. Using an acid-base titration, we found only one pKa
PMID 10327633

Japanese Journal

Sensitive determination of anions in saliva using capillary electrophoresis after transient isotachophoretic preconcentration

Xu Zhongqi,Doi Takayuki,Timerbaev Andrei R.,Hirokawa Takeshi,ジョチュウキ,ドイタカユキ,ヒロカワタケシ,徐中其,土居孝之,廣川健
Talanta 77(1), 278-281, 2008-10-19
… In-line tITP preconcentration conditions, created by introduction of the plugs of 5 mM dithionic acid (leading electrolyte) and 10 mM formic acid (terminating electrolyte) before and after the sample zone, respectively, allowed the limits of direct UV absorption detection (at 200 nm) to be up to 50-fold improved as compared with CE without tITP. …
NAID 120001092463

超臨界水中のジチオン酸の分解反応

上田八郎,井原公生,阿尻雅文,新井邦夫
日本エネルギー学会誌 83(4), 281-284, 2004-04-20
… Dithionic acid, which is difficulty to decompose, is a Chemical Oxygen Demand waste generated during desulfurization. … Experiments were conducted to hydrolyze ditionic acid in SCW. … In the experiments, it was found that decomposition rate of dithionic acid was the same regardless of whether hydrogen peroxide was added or not. … Dithionic acid occurred at 100% conversion at 350℃. …
NAID 110004083548

Related Pictures

[1] International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.

[G.26E-2] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9. pp. 715-716

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