239321

Sodium sulfite

ACS reagent, ≥98.0%

• Linear Formula: Na₂SO₃
• CAS Number: 7757-83-7
• Molecular Weight: 126.04
• EC Number: 231-821-4
• MDL number: MFCD00003503
• UNSPSC Code: 12352302
• PubChem Substance ID: 329752528
• NACRES: NA.21

Properties

• grade: ACS reagent
• 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.

Safety Information

• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable