HoppeSeyler, based primarily on solubilities and distribution, may be conveniently retained.
The various solubilities are shown in the following table: -
It is then dissolved in hydrofluoric acid and heated in order to expel silicon fluoride; finally the columbium, tantalum and titanium fluorides are separated by the different solubilities of their double fluorides (C. Marignac, Ann.
A coordination of the results obtained on the distillation of mixtures of this nature with the introduction of certain theoretical considerations led to the formation of three groups distinguished by the relative solubilities of the vapours in the liquid components.
In order to separate caesium from rubidium, use is made of the different solubilities of their various salts.
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