Salts of Tungstic Acid-II

This division into only two groups is justified by the fact that the metatungstates show marked differences both in properties and in ionic reactivity from those of the ordinary normal and acid tungstates, whilst the latter are very similar in their reactions. The transformation of normal tungstates into ordinary acid tungstates takes place readily, whereas the formation of metatungstates - by the addition of tungstic acid or other acids to tungstates - takes place only slowly and incompletely at ordinary temperatures. Further differences between the two types of salts are found in the peculiar behaviour of metatungstates on dehydration, and in the fact that whilst normal and para-tungstates increase the specific rotatory power of tartaric acid, the metatungstates do not act in this way.


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