Tungstic Acids. In contrast to the compound of the same overall composition mentioned above, tungstic acids are highly condensed, almost insoluble and amorphous species with decreasing water content:
WO3•2H20 (W : H2O ratio 1:2)
WO3•H20 (W : H2O ratio 1:1)
2WO3•H20 (W : H2O ratio 2:1)
Within this group dehydration can be achieved by heating. Heating to approximately 500 0C leads to th500 0C leads to the final stage of dehydration, the water-free, crystallized tungsten trioxide.
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