I Tungsten Hexabromide Ii Tungsten Complexes

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The difficulty which is fre- quently met with, in the purification of substances can, often, be directly attributed to the formation of complexes. For example, Smith and Exner 1 in an exhaustive paper on the atomic weight of tungsten show conclusively that the difficulty of preparing pure tungstic acid is due to the ease with which the latter substance forms complexes. They found that on digesting tungstic acid, which was free of iron, with hydrochloric acid or nitric acid, in which iron was pr...esent, the latter would enter the tungstic acid. Iron, manganese, phosphorus and vanadium were extremely difficult to remove. Indeed an ammonium salt of a complex, containing the oxides of the above elements, was isolated. Similarly, the slimy, greenish or bluish white residue remaining when tungstic acid dissolved in ammonium hydroxide, was found by them to contain ammonium chloride. It was probably an ammonium chlorinated tungstic acid derivative.
Again, Rogers and Smith 2 have shown that the introduction of only a few tenths of one per cent of various dioxides, like TiO 2 and ZrO2, into ammonium vanadico-phospho-tungstate changed its properties and reactions entirely.


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