Sodium pyrosulfite

CAS Registry Number®

7681-57-4
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CAS Name

Sodium pyrosulfite

Molecular Formula

H2O5S2.2Na

Cite this Page

Sodium pyrosulfite.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?ref=7681-57-4 (retrieved 2022-05-21) (CAS RN: 7681-57-4).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Melting Point (1)

    150 °C (decomp)
  • Density (1)

    1.4 g/cm3

Source(s)

  • (1) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)

Other Names and Identifiers

InChI

InChI=1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)

InChIKey

InChIKey=ZBVPOSMABOMSMZ-UHFFFAOYSA-N

SMILES

S(S(=O)O)(=O)(=O)O.[Na]

Canonical SMILES

[Na].O=S(O)S(=O)(=O)O

Other Names for this Substance

  • Disulfurous acid, sodium salt (1:2)
  • Pyrosulfurous acid, disodium salt
  • Disulfurous acid, disodium salt
  • Sodium pyrosulfite (Na2S2O5)
  • Sodium pyrosulfite

Deleted or Replaced CAS Registry Numbers

15771-29-6, 1287784-10-4, 2242622-57-5