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71988

Sigma-Aldrich

Sodium sulfite

BioUltra, anhydrous, ≥98% (RT)

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Synonym(s):
Natrium sulfite
Linear Formula:
Na2SO3
CAS Number:
Molecular Weight:
126.04
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.25

product line

BioUltra

Assay

≥98% (RT)

form

powder

impurities

insoluble matter, passes filter test

loss

≤0.1% loss on drying, 20 °C (HV)

pH

9.0-10.5 (25 °C, 1 M in H2O)

solubility

H2O: 1 M at 20 °C, clear, colorless

anion traces

chloride (Cl-): ≤50 mg/kg
thiosulfate (S2O32-): ≤200 mg/kg

cation traces

Al: ≤5 mg/kg
As: ≤0.1 mg/kg
Ba: ≤5 mg/kg
Bi: ≤5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤200 mg/kg
Li: ≤5 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Mo: ≤5 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Sr: ≤5 mg/kg
Zn: ≤5 mg/kg

absorption

cut-off at 265 nm in H2O at 1 M

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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1 of 4

This Item
S46727128960528
Sodium sulfite BioUltra, anhydrous, ≥98% (RT)

Sigma-Aldrich

71988

Sodium sulfite

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Sodium sulfite BioXtra, ≥98%

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S4672

Sodium sulfite

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Sodium azide BioUltra, ≥99.5% (T)

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71289

Sodium azide

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Potassium sulfate BioUltra, ≥99.0% (AT)

Sigma-Aldrich

60528

Potassium sulfate

Premium Grade
form

powder

form

powder or crystals

form

crystals

form

solid

impurities

insoluble matter, passes filter test

impurities

≤0.005% Insoluble matter, ≤5 ppm Phosphorus (P)

impurities

insoluble matter, passes filter test

impurities

insoluble matter, passes filter test, ≤0.0005% total nitrogen (N)

pH

9.0-10.5 (25 °C, 1 M in H2O)

pH

-

pH

~10.0 (25 °C, 1 M in H2O)

pH

5.5-7.5 (25 °C, 0.5 M in H2O)

solubility

H2O: 1 M at 20 °C, clear, colorless

solubility

H2O: 1 M at 20 °C, clear, colorless

solubility

H2O: 1 M at 20 °C, clear, colorless

solubility

H2O: 0.5 M at 20 °C, clear, colorless

anion traces

chloride (Cl-): ≤50 mg/kg, thiosulfate (S2O32-): ≤200 mg/kg

anion traces

chloride (Cl-): ≤0.02%

anion traces

chloride (Cl-): ≤50 mg/kg, sulfate (SO42-): ≤50 mg/kg

anion traces

chloride (Cl-): ≤5 mg/kg, phosphate (PO43-): ≤10 mg/kg

Other Notes

Cleaves disulfide bonds to form the S-sulfonate derivative; Inhibits gram positive bacteria in culture media;

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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