Sodium selenite

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Sodium selenite
Natriumseleniet t.png
CAS number 10102-18-8
PubChem 24934
EC number 233-267-9
RTECS number VS7350000
ATC code A12CE02
SMILES [Na+].[Na+].[O-][Se]([O-])=O
Molecular formula Na2O3Se
Molar mass 172.92 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 alcohol, ethanol
Crystal structure tetragonal
EU classification Very toxic (T+)
Dangerous for the environment (N)
EU Index 034-003-00-3
NFPA 704

NFPA 704.svg

R-phrases R23, Template:R28, R31, R43, R51/53
S-phrases (S1/2), S28, S36/37, S45, S61
Related compounds
Related compounds Sodium sulfite
Sodium selenate
Sodium selenide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Sodium selenite is a chemical compound. Its chemical formula is Na2SeO3. It contains sodium and selenite ions.

Properties[change | change source]

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[change | change source]

It is made by reacting sodium hydroxide with selenium dioxide

2 NaOH + SeO2 → Na2SeO3 + H2O

Uses[change | change source]

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

Safety[change | change source]

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

Related pages[change | change source]