239321
Sodium sulfite
ACS reagent, ≥98.0%
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About This Item
Linear Formula:
Na2SO3
CAS Number:
Molecular Weight:
126.04
NACRES:
NA.21
PubChem Substance ID:
UNSPSC Code:
12352302
EC Number:
231-821-4
MDL number:
Assay:
≥98.0%
Grade:
ACS reagent
Form:
powder or crystals
Solubility:
water: soluble 126 g/L at 20 °C
grade
ACS reagent
Quality Level
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
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Reaction kinetics of sodium sulfite oxidation by the rapid-mixing method.
Barron CH and O'Hern HA.
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