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Chemistry

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A Cu/Cu^2+concentration cell has a voltage of 0.22v at 25 C. The concentration of Cu^2+ in one of the half cells is 1.5x10^-3 M. What is the concentrate of Cu^2+ in the other half cell?

I think I will have to use Nernst equation, but I am so stuck! please help.
Thank you so much.

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