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239321

Sodium sulfite

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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grade

ACS reagent

Quality Segment

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

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

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

239321-2.5KG: + 239321-25KG: + 239321-12KG: + 239321-VAR: + 239321-500G: + 239321-BULK: + 239321-CH:

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