Experimental mutual diffusion coefficients of potassium chloride, magnesium nitrate, cobalt chloride and beryllium sulphate in aqueous solutions have been compared with those estimated by the Onsager-Fuoss. From the observed deviations, we are proposing a model that allows to estimate the percentages of H 3O + (aq) resulting of hydrolysis of some ions (i.e, beryllium, cobalt, potassium and magnesium ions), contributing in this way to a better knowledge of the structure of these systems. The diffusion of beryllium sulphate is clearly the most affected by the beryllium ion hydrolysis.
diffusion coefficients, aqueous solutions, electrolytes, hydration, коэффициенты диффузии, водные растворы, электролиты, гидратация
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