Sodium pyrosulfate

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Sodium pyrosulfate [1]
Sodium pyrosulfate.png
Names
IUPAC name
Disodium disulfate
Other names
Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.034.190 OOjs UI icon edit-ltr-progressive.svg
EC Number
  • 237-625-5
PubChem CID
  • 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 mass 222.12 g/mol
AppearanceTranslucent white crystals
Density 2.658 g/cm3
Melting point 400.9 °C (753.6 °F; 674.0 K)
Boiling point decomposes at460 °C (860 °F; 733 K)
hydrolyses [2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium pyrosulfate is an inorganic compound with the chemical 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.

Contents

Preparation

Sodium pyrosulfate is obtained by the dehydration of sodium bisulfate: [4] [5]

2 NaHSO4 → Na2S2O7 + H2O

Temperatures above 460 °C further decompose the compound, producing sodium sulfate and sulfur trioxide:

Na2S2O7 → Na2SO4 + SO3

Applications

Sodium pyrosulfate was used in analytical chemistry. Samples are fused with sodium pyrosulfate to ensure complete dissolution before a quantitative analysis. [6] [7]

See also

Related Research Articles

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<span class="mw-page-title-main">Potassium pyrosulfate</span> Chemical compound

Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7.

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References

  1. 1 2 Olsen, 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. ACS. 1 (4): 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 . Retrieved 13 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.
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