Ammonium Paratungstate Insolubility in Water

Ammonium paratungstate is a relatively insoluble salt which dissolves only to the extent of 4.5 parts in 100 parts of water at 22℃. and has limited solubility in hot water. On the other hand, ammonium metatungstate dissolves to the extent of 120 parts per 100 parts of water at 15℃. and is very soluble in hot water.

It is frequently desirable to obtain a relatively high concentration of tungsten in solution, Le. 30% W0 or more at ambient temperature. This is done most readily by dissolving ammonium metatungstate. On the other hand, ammonium paratungstate is a more common product which can be obtained by several methods during the recovery of tungsten from its ores. Heretofore, the market price of ammonium metatungstate has been much higher, compared to ammonium paratungstate, because of the difficulty entailed in manufacturing the former.




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