Abstract

Exchange between thallium(I) and (III) in 2·19 M sulphuric acid is about two-hundred times as fast as in perchloric acid solutions of the same ionic strength and hydrogen ion concentration. We have examined the rate of exchange in perchloric-sulphuric acid mixtures and in sulphuric acid-lithium sulphate mixtures. The experimental evidence shows that the rate can be predicted by several empirical rate equations. Some mechanisms, which lead to the rate equations, are discussed. We have also measured the rate of exchange as a function of sulphuric acid concentration and ionic strength, and as a function of temperature.

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