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 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. Sodium bisulfite is used in a variety industries such as a food additive with E number E222 in the food industry. It is a reducing agent in the cosmetic and in the bleaching applications.

Names



IUPAC name Sodium hydrogen sulfite
Other names E222 sodium bisulphite
Identifiers
CAS Number	7631-90-5^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:26709^Y
ChEMBL	ChEMBL1689285^N
ChemSpider	571016^Y
ECHA InfoCard	100.028.680
E number	E222 (preservatives)
PubChem CID	23665763
RTECS number	VZ2000000
UNII	TZX5469Z6I^Y
CompTox Dashboard (EPA)	DTXSID8034902
InChI InChI=1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1^Y Key: DWAQJAXMDSEUJJ-UHFFFAOYSA-M^Y 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 (n_D)	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). N verify (what is ^YN ?) Infobox references