XLII.The diffusion of electrolytes

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Abstract
An account is given of an investigation, employing a modified form of the method developed by Clark, of the diffusion of the bivalent binary salts, magnesium sulphate and cadmium sulphate in aqueous solution. Contrary to Arrhenius's theory, which is supported by Clark' work with the univalent chlorides, the results show a definite minimum value of the coefficient of diffusion in solutions of concentration 1·4 N. and 1·8 N. respectively. Considerations are put forward in support of the view that the discrepancies in the behaviour of the two groups of electrolytes are due to the presence of complex ions and a larger proportion of unionized molecules in solutions of the latter. The theory of ionic solvation is supported by the form of the curves obtained.

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