Sodium tungstate, Na₂WO₄?2H₂O, 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. 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.

Variants of sodium tungstate:
sodium tungstate or sodium wolframate

Properties: colorless crystal or white crystalline powder. In dry air weathering, lose crystal water at 100 ℃. Soluble in water, soluble in ethanol. The relative density of 3.23 ~ 3.25. Melting point 698 ℃ (dry goods).