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giareyes_2B wrote:In a concentration cell, why do you need the product concentration to be lower than the reactants? Is it because that would favor a forward reaction rather than a reverse reaction?
Q= (anode)/(cathode). In a concentration cell, you need the anode concentration to be lower than the concentration of the cathode because this way you can obtain a higher voltage.
The substance at the anode is oxidized from a solid to an aqueous cation while at the cathode the ion is reduced to the solid form. Therefore, for a current to run we want the substance at the anode to be oxided into the cation, which would happen if the anode presently has a lower concentration of cation than the cathode.
You need the difference in concentration so that in order for the reaction to be spontaneous, the electrons that are lost in the anode must move to the cathode. Therefore, the reactants must have a larger concentration so that the reaction in the anode takes place so that the electrons move from the anode to the cathode
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