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In a concentration cell, both of your electrodes in your cathode and anode are the same material. The solutions in the cathode and anode are the same. This indicates that your standard cell potential is zero. So a concentration cell is a galvanic cell whose standard reduction potential is zero. In the cell diagram, you would see that the same molecules would be reacting in both the cathode and anode. The solutions in the cathode and anode only differ in concentration.
To add to the response above, when calculating Ecell for a concentration cell, always make the lower concentration the product for Q. For a general galvanic cell, the standard reduction potential is calculated using the table of reductional potentials. In a concentration cell, the standard reduction potential is 0 but Ecell can still be calculated.
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