Ion-exchange membranes have been used in commercial water desalination and wastewater treatment centers for decades. The key feature of these membranes is their permselectivity. The primary mechanism that governs permselectivity is highly debated, especially as these pores reach molecular dimensions. In this work, a 30 nm commercially available polycarbonate membrane is gold-plated using an electroless template synthesis method. By varying gold-plating time, one can create pores with diameters as small as 1 nm. These membranes are exposed to various chloride salt solutions, which forms a layer of adsorbed chloride along the faces of the membrane and pore walls. This fixed negative charge allows for the rejection of anions and the transport of cations across the membrane. Using a varying concentration cell, the selectivity of these membranes can be investigated potentiometrically by the transference numbers. These membranes express ideal cation permselectivity so long as the thickness of the electrical double layer is larger than the radius of the nanotubes. Individual cation influence on membrane permselectivity is investigated using gold plated pores with diameters smaller than 10 nm.