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It will decrease the concentration. To find out how this affects cell potential, you can plug numbers into E=-RT/nF lnQ with alterations to Q. For instance, if the cathode's concentration decreases, cell potential will increase.
How adding water affects cell potential is dependent on which solution it is diluting. If it is diluting the anode solution, then the overall Q is decreased, decreasing the lnQ expression and therefore increasing cell potential since the [-RTlnQ] term is smaller.
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