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Sodium tellurite

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Sodium tellurite
Sodium tellurite 2.jpg
Other names Sodium Tellurite IV, Tellurous acid disodium salt
CAS number 10102-20-2
PubChem 24935
RTECS number WY2450000
SMILES [Na+].[Na+].[O-][Te]([O-])=O
Molecular formula Na2TeO3
Molar mass 221.57774 g/mol
Appearance white crystals, powder
Density 6.245 g/cm3
Melting point

710 °C

Boiling point

unknown (very high)

Solubility in water soluble
greater than or equal to 100 mg/mL at 68°F
Crystal structure rhombic
R-phrases R23 R24 R25
S-phrases Template:S22 S36 S37 S39 S45
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Sodium tellurite is a chemical compound. Its chemical formula is Na2TeO3. It contains sodium and tellurite ions.


Sodium tellurite is a colorless solid. The tellurite ion can react with water to make sodium hydrogen tellurite, NaHTeO3. 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 tellurates). It is part of the process in making tellurium.


It is made by reacting tellurium dioxide with sodium hydroxide, or by heating a telluride in air with sodium carbonate.


Sodium tellurite is used in making tellurium. It is also used to make electroplated nickel corrosion-resistant. It can also be used to add a bluish coating to steel. It can be used to isolate certain types of bacteria that it is not toxic to.

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