The mercury electrode has been studied in both the ideally polarized and faradaic regions of potential using the transient impedance technique coupled with Laplace plane analysis. Both real and imaginary axis impedance values were obtained at frequencies up to 108 rad s−1 using an ultra-fast potentiostat coupled with signal averaging techniques. Results in the ideally polarized region of potentials showed no frequency dispersion. Results in the faradaic potential region showed that Hg/Hg22+ follows the strightforward Randles-Ershler scheme. Self consistent results were obtained only after using a linearization procedure involving addition of the absolute values of the experimental voltages and currents for cathodicand anodic perturbations. No evidence for specific adsorption of Hg22+ was obtained nor any unusual double layer capacitance in the presence of the faradaic process.