Sodium selenite

Sodium selenite
Identifiers
CAS Number	10102-18-8 ; 26970-82-1 (pentahydrate) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48843 ;
ChEMBL	ChEMBL112302 ;
ChemSpider	23308 ;
ECHA InfoCard	100.030.230
EC Number	233-267-9;
KEGG	D10530 ;
PubChem CID	24934;
RTECS number	VS7350000;
UNII	HIW548RQ3W ; 0WV4L961ZV (pentahydrate) ;
UN number	2630
CompTox Dashboard (EPA)	DTXSID0032077 ;
	InChI InChI=1S/2Na.H2O3Se/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2 Key: BVTBRVFYZUCAKH-UHFFFAOYSA-L ; InChI=1/2Na.H2O3Se/c;;1-4(2)3/h;;(H2,1,2,3)/q2+1;/p-2 Key: BVTBRVFYZUCAKH-NUQVWONBAC;
	SMILES [Na+].[Na+].[O-][Se]([O-])=O;
Properties
Chemical formula	Na2O3Se
Molar mass	172.948 g·mol−1
Appearance	colourless solid
Density	3.1 g/cm3
Melting point	decomposes at 710 °C
Solubility in water	85 g/100 mL (20 °C)
Solubility	insoluble in ethanol
Structure
Crystal structure	tetragonal
Pharmacology
ATC code	A12CE02 (WHO) (Oral), B05XA20 (WHO) (Parenteral)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H317, H331, H411
Precautionary statements	P261, P264, P270, P271, P272, P273, P280, P301+P310, P302+P352, P304+P340, P311, P321, P330, P333+P313, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	3 0 0
Safety data sheet (SDS)	ICSC 0698
Related compounds
Related compounds	Sodium sulfite ; Sodium selenate ; Sodium selenide ; sodium biselenite
	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 selenite is the inorganic compound with the formula Na₂SeO₃. This salt is a colourless solid. The pentahydrate Na₂SeO₃(H₂O)₅ is the most common water-soluble selenium compound.

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