Sodium tungstate

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Sodium tungstate
IUPAC name	[show] Sodium tungstate
Identifiers
CAS number	[13472-45-2]
PubChem	165917
RTECS number	YO7875000
Properties
Molecular formula	Na2O4W
Molar mass	293.82 g mol−1
Appearance	white rhombohedral crystals
Density	4.179 g/cm3
Melting point	698°C
Solubility in water	74.2 g/100 mL[1]
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Sodium tungstate, Na₂WO₄, a tungstate of sodium, is useful as a source of tungsten. It is prepared from tungsten ores used to manufacture tungsten by reducing it.

It is often found as the dihydrate, Na₂WO₄•2H₂O. This salt is soluble in water and is a moderately strong oxidizing agent, but finds no common use in the chemistry laboratory. Like the molybdate, the deep-coloured complex tungstate(VI,V) is formed on reducing the compound with a very mild reducing agent, such as complex organic compounds. It is also thought to be a possible inhibitor of protein-tyrosine phosphatase (PTPase).^{[citation needed]}It is also sometimes used as a fireproofing agent.

In organic chemistry, sodium tungstate is used as catalyst for epoxidation

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