CHEMISTRY HELP PLEASE!!!

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The cell potential of the following electrochemical cell depends on the pH of the solution in the anode half-cell:
Pt(s)|H2(g,1atm)|H+(aq,?M)||Cu^2+(aq,1.0M)|Cu(s)
what is the pH of the solution if Ecell is 375 mV?

I first got .65 as my pH, but it said that it was wrong. Please explain how to solve this problem!

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