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Tungstate
From Wikipedia, the free encyclopedia
The tungstate ion is WO42−.
A tungstate (compound) is a compound containing the tungstate ion, or more complicated polymeric ions.
See category for a list.
Tungstates are salts of tungstic acid.
Unlike chromate, tungstate is not a good oxidizer, but like it, it polymerizes in acid and depolymerizes back to tungstates in alkaline solutions. Tungstates occur naturally with molybdates. Powellite is a mineral form of calcium molybdate containing a small extent of tungstate, and scheelite is a mineral form of calcium tungstate containing a small extent of molybdate. Wolframite is manganese and iron tungstate, and all these are valuable sources of tungsten. Solutions of tungstates, like those of molybdates, give intensely blue solutions of complex tungstate(V,VI) analoguous to the molybdenum blues when reduced by most organic materials. Therefore it could be used to trace paths of solutes in chromatography in which the solute (usually organic if used for this purpose) is colourless. Tungstate can also be used as an oxidizing agent in the oxidation of cyclohexene. The tungstate can be constantly regenerated through the presence of hydrogen peroxide.
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