IN recent years, numerous investigations have been carried out bearing on the conductivity of non-aqueous solutions, Waldm in particular being responsible for the collection and correlation of data in this field. As is well known, he has succeeded in deducing various interesting relationships between conductivity and ionisation on the one hand, and the physical properties (notably viscosity and specific inductive capacity) of the solvent on the other.
If there is a summit, the composition of the mixture, which freezes at this maximum temperature, gives the formula of the compound produced. When the two constituent substauces form more than one compound, there is a branch of the composite curve corresponding with each, and when solidification commences in a mixture the composition of which lies within the limits of such a branch, the solid that separates is the compound to which this particular branch belongs. These types of composite freezing point curves have been experimentally realised for binary systems of various kinds. Thus, curves like that in Fig. ' 1 have been obtained for mixtures of inorganic salts
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