Ammonium metatungstate is a white or slightly yellow crystalline powder that is soluble in water but insoluble in ethanol.
Ammonium metatungstate, chemical formula (NH4) 6H2W12O40•xH2O. White crystalline powder. Specific gravity 4. soluble in water. It decomposes into a relatively stable compound (NH4) 6H2W12O40•xH2O after heating at 200-300°C; it finally decomposes into tungsten trioxide when heated above 300°C. It is obtained by the interaction between ammonium paratungstate and tungstic acid and crystallization by low temperature concentration.
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