Salts of Tungstic Acid-III

Of the numerous types of salts of ordinary tungstic acid only two (the normal, of composition R₂O.WO₃.xH₂O, and the so-called para-tungstates in which the ratio R₂O:WO₃ = 3:7 or 5:12) have been accurately investigated and their existence established beyond doubt. The readiness with which one type of salt is transformed into another, and the fact that paratungstates decompose on prolonged contact with water or on heating, make exact analysis almost impossible; and an added difficulty lies in the high atomic weight of tungsten, the difference in composition of various compounds with high tungsten content being very small. It is from such causes that, although the paratungstates are recognised as a well-defined series of salts, their actual constitution and relation to the normal tungstates remains unestablished. Further, the higher acid salts such as hexa- and octa-tungstates appear to show a closer relation to meta-tungstates than to ordinary tungstates, but the nature of this has not been determined. According to Smith, tungstates of the type 4R₂O.10WO₃.xH₂O constitute another very definite series of salts.


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