When an electrode (e.g. Fe) is immersed in a solvent (e.g. H 2O) some metal ions leave the electrode and –ve charge builds up in the electrode
The solvent becomes +ve and the opposing electrical layers lead to a dynamic equilibrium wherein there is no further (net) dissolution of the electrode
The potential developed by the electrode in equilibrium is a property of the metal of electrode → the electrode potential
The electrode otential is measured with the electrode in contact with a solution containing an unit concentration of the ions of the same metal with the standard hydrogen electrode as the counter electrode (whose potential is taken to be zero)
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