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239321

Sigma-Aldrich

Sodium sulfite

ACS reagent, ≥98.0%

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Linear Formula:
Na2SO3
CAS Number:
Molecular Weight:
126.04
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

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

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This Item
S050531454901916
Sodium sulfite ACS reagent, ≥98.0%

Sigma-Aldrich

239321

Sodium sulfite

Essential Grade
Sodium sulfite ≥98%

Sigma-Aldrich

S0505

Sodium sulfite

-
Sodium sulfite puriss. p.a., reag. Ph. Eur., anhydrous, 98-100.0% (iodometric)

Sigma-Aldrich

31454

Sodium sulfite

-
Sodium sulfite anhydrous, Redi-Dri™, reagent grade, ≥98%

Sigma-Aldrich

901916

Sodium sulfite

-
assay

≥98.0%

assay

≥98%

assay

98-100.0% (iodometric)

assay

≥98%

form

powder or crystals

form

powder or crystals

form

solid

form

powder or crystals

impurities

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

impurities

-

impurities

≤0.001% heavy metals (as Pb), ≤0.02% thiosulfate (S2O3)

impurities

-

pH

9.0-10.5 (25 °C, 126 g/L)

pH

9.0-10.5 (25 °C, 126 g/L)

pH

9.0-10.5 (25 °C, 126 g/L)

pH

9-10.5 (25 °C, 126 g/L)

solubility

water: soluble 126 g/L at 20 °C

solubility

-

solubility

-

solubility

-

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.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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