Abstract
Double layer parameters for the adsorption of thiourea on mercury were obtained at constant charge and at constant potential on the electrode. In both cases the adsorption isotherm was found to be congruent on the electrical variable. The virial adsorption isotherm is quite adequate to describe the adsorption of thiourea but a different virial coefficient is needed in each case. The study of this simultaneous congruence led to the conclusion that when the adsorption of neutral molecules is considered in terms of the two electrical variables a much more convenient picture of the behaviour of the interface is obtained.
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