View source for Sodium selenite

{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 464403878
| ImageFile = Sodium selenite.ვკ.jpg
| ImageSize =
| IUPACName =
| OtherNames =
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 23308
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = HIW548RQ3W
| InChI = 1/2Na.H2O3Se/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
| InChIKey = BVTBRVFYZUCAKH-NUQVWONBAC
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 48843
| SMILES = [Na+].[Na+].[O-][Se]([O-])=O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/2Na.H2O3Se/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = BVTBRVFYZUCAKH-UHFFFAOYSA-L
| CASNo = 10102-18-8 (hydrate: 26970-82-1)
| CASNo_Ref = {{cascite|changed|CAS}}
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 112302
| PubChem = 24934
| EINECS = 233-267-9
| RTECS = VS7350000
| UNNumber = 2630
| KEGG_Ref = {{keggcite|changed|kegg}}
| KEGG = D10530
 }}
|Section2={{Chembox Properties
| Na=2 | Se=1 | O=3
| Appearance = colorless solid
| Density = 3.1 g/cm<sup>3</sup>
| MeltingPt = decomposes at 710 °C
| BoilingPt =
| Solubility = 85 g/100 mL (20 °C)
| SolubleOther = insoluble in [[alcohol]], [[ethanol]]
 }}
|Section3={{Chembox Structure
| CrystalStruct = tetragonal
 }}
|Section6={{Chembox Pharmacology
| ATCCode_prefix = A12
| ATCCode_suffix = CE02
}}
|Section7={{Chembox Hazards
| ExternalSDS = [http://www.inchem.org/documents/icsc/icsc/eics0698.htm ICSC 0698]
| EUClass = Very toxic ('''T+''')<br/>Dangerous for the environment ('''N''')
| RPhrases = {{R23}}, {{R28}}, {{R31}}, {{R43}}, {{R51/53}}
| SPhrases = {{S1/2}}, {{S28}}, {{S36/37}}, {{S45}}, {{S61}}
| NFPA-H = 3
| NFPA-F = 0
| NFPA-R = 0
| FlashPt =
 }}
|Section8={{Chembox Related
| OtherCompounds = [[Sodium sulfite]] <br> [[Sodium selenate]] <br> [[Sodium selenide]]
 }}
}}
'''Sodium selenite''' is a [[chemical compound]]. Its [[chemical formula]] is Na<sub>2</sub>SeO<sub>3</sub>. It contains [[sodium]] and [[selenite]] [[ion]]s.

==Properties==
Sodium selenite is a white solid. It dissolves in water. It is a weak [[oxidizing agent]]. It reacts with acids to make [[selenous acid]]. It can be oxidized by powerful oxidizing agents to make [[sodium selenate]]. 

==Preparation==
It is made by reacting [[sodium hydroxide]] with [[selenium dioxide]]

:2 NaOH + SeO<sub>2</sub> → Na<sub>2</sub>SeO<sub>3</sub> + H<sub>2</sub>O

==Uses==
Sodium selenite is used to add a pink color to glass. It is also used in some [[vitamin]] supplements. 

==Safety==
Eating of any more than a very tiny amount would give selenium poisoning. 

==Related pages==
*[[Sodium selenide]]



[[Category:Selenium compounds]]
[[Category:Sodium compounds]]