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This page contains a copy of the infobox ({{chembox}}) taken from revid 476523071 of page Sodium_sulfite with values updated to verified values.

Sodium sulfite

anhydrous hydrate
Names
IUPAC name Sodium sulfite
Other names Hypo clear (photography) E221
Identifiers
CAS Number	7757-83-7
3D model (JSmol)	Interactive image
ChemSpider	22845
PubChem CID	24437
RTECS number	WE2150000
UNII	VTK01UQK3G
InChI InChI=1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2Key: GEHJYWRUCIMESM-UHFFFAOYSA-L InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2Key: GEHJYWRUCIMESM-NUQVWONBAK
SMILES S(=O)..
Properties
Chemical formula	Na2SO3
Molar mass	126.043 g/mol
Appearance	white solid
Density	2.633 g/cm (anhydrous) 1.561 g/cm (heptahydrate)
Melting point	33.4 °C (dehydration of heptahydrate) 500 °C (anhydrous)
Boiling point	Decomposes(separate (substances) into constituent elements)
Solubility in water	678 g/L (18 °C, heptahydrate)
Structure
Crystal structure	hexagonal (anhydrous) monoclinic (heptahydrate)
Hazards
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
Related compounds
Other anions	Sodium selenite
Other cations	Potassium sulfite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references