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Sodium pyrosulfate

From Wikipedia, the free encyclopedia
Sodium pyrosulfate[1]
Names
IUPAC name
Disodium disulfate
Other names
Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard100.034.190Edit this at Wikidata
EC Number
  • 237-625-5
  • InChI=1S/2Na.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
    Key: JXAZAUKOWVKTLO-UHFFFAOYSA-L
  • [Na+].[Na+].[O-]S(=O)(=O)OS(=O)(=O)[O-]
Properties
Na2S2O7
Molar mass222.12 g/mol
AppearanceTranslucent white crystals
Density2.658 g/cm3
Melting point400.9 °C (753.6 °F; 674.0 K)
Boiling pointdecomposes at 460 °C (860 °F; 733 K)
hydrolyses[2]
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound

Sodium pyrosulfate is aninorganic compound with thechemical formula of Na2S2O7.[1] It is a colorless salt.[3] It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.

Preparation

[edit]

Sodium pyrosulfate is obtained by heatingsodium bisulfate to 280 °C (536 °F)[4][5]

2 NaHSO4 → Na2S2O7 + H2O

Temperatures above 460 °C furtherdecompose the compound, producingsodium sulfate andsulfur trioxide:

Na2S2O7 → Na2SO4 + SO3

Applications

[edit]

Sodium pyrosulfate was used inanalytical chemistry. Samples arefused with sodium pyrosulfate to ensure complete dissolution before aquantitative analysis.[6][7]

See also

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References

[edit]
  1. ^abOlsen, J. C., ed. (1934).Van Nostrand's Chemical Annual. London: Chapman and Hall.
  2. ^Heinz K. Hofmeister; John R. Van Wazer (1962). "Hydrolysis of Sodium Pyrosulfate".Inorganic Chemistry.1 (4). ACS:811–812.doi:10.1021/ic50004a019.
  3. ^Helmold Plessen (2000). "Sodium Sulfates".Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH.doi:10.1002/14356007.a24_355.ISBN 978-3527306732.
  4. ^Noyes, William (1913).A Textbook of Chemistry. New York: Henry Holt and Company. p. 186. Retrieved13 January 2016.
  5. ^von Plessen, Helmold (2000). "Sodium Sulfates".Ullmann's Encyclopedia of Industrial Chemistry.doi:10.1002/14356007.a24_355.ISBN 9783527303854.
  6. ^Nemodruk, Aleksandr; Karalova, Zinaida (1969).Analytical chemistry of boron: Analytical chemistry of the elements. Charlottesville, VA: Ann Arbor-Humphrey Science Publishers. pp. 23 & 193.ISBN 9780250399192.
  7. ^Kiely, P. V.; Jackson, M. L. (1965). "Quartz, Feldspar, and Mica Determination for Soils by Sodium Pyrosulfate Fusion".Soil Science Society of America Journal.29 (2):159–163.Bibcode:1965SSASJ..29..159K.doi:10.2136/sssaj1965.03615995002900020015x.
Inorganic
Halides
Chalcogenides
Pnictogenides
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Organic
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