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Sigma-Aldrich

Sodium metabisulfite

reagent grade, 97%

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Synonym(s):
Sodium disulfite, Sodium pyrosulfite
Linear Formula:
Na2S2O5
CAS Number:
7681-57-4
Molecular Weight:
190.11
EC Number:
231-673-0
MDL number:
MFCD00167602
PubChem Substance ID:
329751131
NACRES:
NA.55

grade

reagent grade

Assay

97%

form

powder or crystals

pH

4.5 (20 °C, 50 g/L)

mp

>300 °C (lit.)

solubility

water: soluble 650 g/L at 20 °C

SMILES string

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

InChI

1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

InChI key

HRZFUMHJMZEROT-UHFFFAOYSA-L

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General description

Sodium metabisulfite (MBS, Sodium disulfite) is the sodium salt of disulphurous (pyrosulfurous) acid. It is also commonly added to various food products and wines as a preservative.

Application

Sodium metabisulfite may be used to initiate the cross-linking of polybutadiene by free radical polymerization. It may be used to prevent the oxidation (as antioxidant) during the preparation of stock solutions of 6-hydroxydopamine (6-OHDA) and 6-OHDA HBr in various studies.

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H302 - H318

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1

Supplementary Hazards

EUH031

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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