Salts of Tungstic Acid-VI

The content of base to acid in paratungstates was first given by Laurent as 5R₂O:12WO₃, whilst Lotz and Scheibler suggested the formula 3R₂O.7WO₃.xH₂O. Marignac, after careful analysis, concluded that most paratungstates contained 5R₂O:12WO₃, but that a few contained 3R₂O:7WO₃. Other investigators, for reasons mentioned above, were unable to decide between the two formulae. Copaux, from the behaviour of the salts towards dehydration, considered them to be hydrotungstates and gave them the co-ordinative formula R^•₅[H(W₂O₇)₃].aq. In support of this he points to the fact that the paratungstates resemble the complex tungstates in absorbing ultraviolet light, whereas normal tungstates do not do so. Rosenheim suggests that they are 6-tungsto-aquates of composition R₅H₅[H₂(WO₄)₆]aq.


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