The Variation of the Transference Numbers of Potassium Chloride in Aqueous Solution with Temperature

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Abstract
The transference numbers of potassium chloride in aqueous solution have been determined for concentrations from 0.01N to 0.10N at temperatures from 15°C to 45°C by the moving boundary method. Both cation and anion boundaries were used. The results obtained by the two methods are in satisfactory agreement, the sum (t++t‐) for a solution being unity within a few units in the fourth decimal place; the data reported here are also in close agreement with those reported by Longsworth for 25°C. For the whole range of temperature, the Longsworth function t+°′ is linear in the concentration. It is found, however, that the cation transference number decreases with rising temperature, in contradiction to the Kohlrausch generalization which predicts that transference numbers less than one‐half should increase with rising temperature.