The conductance behaviour of a microporous membrane prepared by the hydrogen peroxide treatment of ion-exchange membranes of the Neosepta family has been studied with aqueous solutions of potassium halides, halates and nitrate. The membranes were bathed in these salt solutions at different concentrations, and the conductances for each concentration were studied at different temperatures. The normal behaviour of these conductances shows that the values increase smoothly with increase in concentrations, tending towards limiting values at higher concentrations. The magnitudes for the halide ions initially follow the order Br − > I − > Cl − at lower concentrations. As the concentrations increase, the order finally shows the sequence I − > Br − > Cl −, and this sequence is more prominent with rise in temperature above 298 K. Values for the oxyanions more or less follow the order ClO 3 − > NO 3 − > BrO 3 − > IO 3 − at all concentrations and over the temperature range, 298-323 K, studied here. The temperature variation of the conductance values has been utilised to calculate the activation energies acording to Arrhenius and to Eyring, and other thermodynamic activation parameters, Δ H≠ and Δ G≠, assuming the applicability of the theory of absolute reaction rate. The most interesting feature is that the activation energies of the ions follow the same sequence as the conductance values, suggesting that in addition to the normal activation energies required for their jumping from one position to the other, some extra energies are required to overcome the obstructions in the path. The energy values for any particular electrolyte, however, decrease with increase in concentration of the bathing electrolyte. The values of Δ S≠ are small and negative, indicating some kind of immobilisation tendencies in the conduction process. The values with different ions at any particular concentration, however, show a gradation, the sequence of which runs parallel to that of the activation energies; this points to the possibility of utilisation of some energy for the structural disorder of the solvent within the pores of the membrane.