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Names | |
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IUPAC name
Sodium hydrogen sulfite
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Other names
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.028.680 |
E number | E222 (preservatives) |
PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
NaHSO3 | |
Molar mass | 104.061 g/mol |
Appearance | White solid |
Odor | Slight sulfurous odor |
Density | 1.48 g/cm3 |
Melting point | 150 °C (302 °F; 423 K) |
Boiling point | 315 °C (599 °F; 588 K) |
42 g/100 mL | |
Refractive index (nD)
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1.526 |
Hazards | |
GHS labelling: | |
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H302 | |
P301+P312+P330 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible)
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none[1] |
REL (Recommended)
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TWA 5 mg/m3[1] |
IDLH (Immediate danger)
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N.D.[1] |
Related compounds | |
Other anions
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Sodium sulfite Sodium metabisulfite Sodium biselenite |
Other cations
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Potassium bisulfite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO3. Sodium bisulfite is not a real compound,[2] but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions. It appears in form of white or yellowish-white crystals with an odor of sulfur dioxide. Regardless of its ill-defined nature, sodium bisulfite is used in many different industries such as a food additive with E number E222 in the food industry, a reducing agent in the cosmetic industry, and a decomposer of residual hypochlorite used in the bleaching industry.[3][4][5]
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