What is Sodium tellurite?
{{chembox | Name = Sodium tellurite | ImageFile = Sodium tellurite 2.jpg | ImageSize = 250px | ImageName = | IUPACName = | OtherNames = Sodium Tellurite IV, Tellurous acid disodium salt | Section1 = {{Chembox Identifiers | SMILES = [Na+].[Na+].[O-][Te]([O-])=O | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID = 23309 | InChI = 1/2Na.H2O3Te/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 | InChIKey = VOADVZVYWFSHSM-NUQVWONBAS | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/2Na.H2O3Te/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = VOADVZVYWFSHSM-UHFFFAOYSA-L | CASNo = 10102-20-2 | PubChem = 24935 | RTECS = WY2450000 }} | Section2 = {{Chembox Properties | Formula = Na<sub>2</sub>TeO<sub>3</sub> | MolarMass = 221.57774 g/mol | Appearance = white crystals, powder | Density = 6.245 g/cm<sup>3</sup> | Solubility = soluble <br> greater than or equal to 100 mg/mL at 68°F | MeltingPt = 710 °C | BoilingPt = unknown (very high) | pKa = | pKb = }} | Section3 = {{Chembox Structure | MolShape = | Coordination = | CrystalStruct = rhombic | Dipole = }} | Section7 = {{Chembox Hazards | ExternalMSDS = | MainHazards = | FlashPt = | RPhrases = {{R23}} {{R24}} {{R25}} | SPhrases = {{S22}} {{S36}} {{S37}} {{S39}} {{S45}} | LD50 = 20 mg/kg }} | Section8 = {{Chembox Related | OtherAnions = | OtherCations = | OtherCpds = }} }} '''Sodium tellurite''' is a [[chemical compound]]. Its chemical formula is Na<sub>2</sub>TeO<sub>3</sub>. It contains [[sodium]] and [[tellurite]] [[ion]]s. == Properties == Sodium tellurite is a colorless solid. The tellurite ion can react with water to make sodium hydrogen tellurite, NaHTeO<sub>3</sub>. It dissolves in water easily. It is a weak [[oxidizing agent]] (can be reduced to [[tellurium]]) and a weak [[reducing agent]] (can be oxidized to [[tellurate]]s). It is part of the process in making tellurium. == Preparation == It is made by reacting [[tellurium dioxide]] with [[sodium hydroxide]], or b