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	monoclinic (anhydrous)
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 pink coloured pentahydrate Na₂SeO₃(H₂O)₅ is the most common water-soluble selenium compound.

Identifiers

CAS Number	10102-18-8^Y 26970-82-1 (pentahydrate)^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:48843^Y
ChEMBL	ChEMBL112302^Y
ChemSpider	23308^Y
ECHA InfoCard	100.030.230
EC Number	233-267-9
KEGG	D10530^Y
PubChem CID	24934
RTECS number	VS7350000
UNII	HIW548RQ3W^Y 0WV4L961ZV (pentahydrate)^Y
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^Y Key: BVTBRVFYZUCAKH-UHFFFAOYSA-L^Y 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	monoclinic (anhydrous)
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). N verify (what is ^YN ?) Infobox references