Sodium bisulfite

Sodium bisulfite
Names
	IUPAC name Sodium hydrogen sulfite
	Other names E222, sodium bisulphite
Identifiers
CAS Number	7631-90-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:26709 ;
ChEMBL	ChEMBL1689285 ;
ChemSpider	571016 ;
ECHA InfoCard	100.028.680
E number	E222 (preservatives)
PubChem CID	23665763;
RTECS number	VZ2000000;
UNII	TZX5469Z6I ;
CompTox Dashboard (EPA)	DTXSID8034902 ;
	InChI InChI=1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1 Key: DWAQJAXMDSEUJJ-UHFFFAOYSA-M ; InChI=1/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1 Key: DWAQJAXMDSEUJJ-REWHXWOFAL;
	SMILES [Na+].[O-]S(=O)O;
Properties
Chemical formula	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)
Solubility in water	42 g/100 mL
Refractive index (nD)	1.526
Hazards
	GHS labelling:
Pictograms
Hazard statements	H302
Precautionary statements	P301+P312+P330
NFPA 704 (fire diamond)	2 0 1
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 5 mg/m3
IDLH (Immediate danger)	N.D.
Related compounds
Other anions	Sodium sulfite; Sodium metabisulfite; Sodium biselenite
Other cations	Potassium bisulfite
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO₃. Sodium bisulfite in fact is not a real compound, 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.

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