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239321

Sodium sulfite

Name: Sodium sulfite
Brand: SIGALD

ACS reagent, ≥98.0%

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About This Item

Linear Formula:

Na₂SO₃

CAS Number:

7757-83-7

Molecular Weight:

126.04

NACRES:

NA.21

PubChem Substance ID:

329752528

UNSPSC Code:

12352302

EC Number:

231-821-4

MDL number:

MFCD00003503

Assay:

≥98.0%

Grade:

ACS reagent

Form:

powder or crystals

Solubility:

water: soluble 126 g/L at 20 °C

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Properties

grade

ACS reagent

Quality Level

200

agency

suitable for SM 5210

assay

≥98.0%

form

powder or crystals

impurities

Free acid, passes test, ≤0.005% insolubles, ≤0.03 meq/g Titr. free base

pH

9.0-10.5 (25 °C, 126 g/L)

solubility

water: soluble 126 g/L at 20 °C

anion traces

chloride (Cl^-): ≤0.02%

cation traces

Fe: ≤0.001%, heavy metals (as Pb): ≤0.001%

SMILES string

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

InChI

1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2

InChI key

GEHJYWRUCIMESM-UHFFFAOYSA-L

Description

General description

Sodium sulfite is a water-soluble inorganic salt that is commonly used as a reducing agent. It is also used for sulfonation and sulfomethylation reactions. Additionally, it is used in the textile industry as a bleaching, de-sulfurizing, and dechlorinating agent. As an oxygen and free chlorine scavenger, Na₂SO₃ is employed in the water treatment process. Sodium sulfite participates in the purification and isolation of aldehydes and ketones by forming adducts with them. Other uses include the production of sodium thiosulfate, detergents, and dyes.

Application

Sodium sulfite can be used:

As a reducing agent in the hydroxylation of arylboronic acids and arylboronic esters into corresponding phenols.
In the transformation of α-amino alcohol methanesulfonate hydrochlorides to sodium α-amino alkanesulfonates.
As a SO₂ precursor in the multigram synthesis of DABCO·(SO₂)₂ abbreviated as DABSO.

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Storage Class

13 - Non Combustible Solids

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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Global Trade Item Number

SKU	GTIN
239321-500G	04061838787514
239321-2.5KG	04061837768958