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Concentration cells are special in that they create electricity because of only a difference in concentration. The difference in ion concentration drives electron flow because the system wants to reach equilibrium. There is only a difference in concentration because it is the same solution.
A concentration cell consists of two half-cells with the same electrodes but with different concentrations. This difference in ion concentration drives the flow of electrons from the more concentrated solution to the lower concentrated solution, which creates a voltage as the cell reaches equilibrium. The concentration gradient creates this voltage.
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