Abstract
The impedance of a dropping mercury electrode in 57% HI (⊂7.6 M ) was measured at temperatures between −35° and +25°C. In a certain potential and temperature region, two reactions were found to be proceeding simultaneously: the reversible Hg/HgI 4 −2 reaction and the irreversible H + /H 2 (Hg) reaction. Analysis of the impedance data gave information about the impedance parameters of both electrode reactions, and about the double-layer capacity. The temperature-dependences of the transfer coefficient and the exchange current density of the H + /H 2 (Hg) reaction are reported. The transfer coefficient decreases with temperature. The apparent heat of activation is 21.6 kcal mol −1 .
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