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If you have different concentrations of the same species in the sides of the cell, then in the Nernst equation, Eo is zero but lnQ is nonzero. Eo is zero because there is no difference in reduction potential (same species). Since you have more reactants than products (difference in concentration), lnQ is nonzero and therefore the E of the cell is some positive number. Q would be the same species on both the numerator and denominator, but since the concentrations are different, the cell works.
in a concentration cell, the standard potential energy is 0 and the potential energy is very low voltage. the whole reaction is driven entirely by a change in concentration gradient. thus the reaction proceeds because there is a tendency to move from high concentration to low concentration
In a concentration cell, the reaction is driven by a difference in concentration, with electrons flowing from the anode (which should be at a lower concentration) to the cathode (which should be at a higher concentration). The voltage is created as the two concentrations move towards equilibrium.
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