Calculate the pH of the cathode compartment for the following reaction given

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Calculate the pH of the cathode compartment for the following reaction given Gcell=3.01V when [Cr3+]= 0.15 M[Al3+]=0.30 M,and [Cr2O2−7]=0.55 M
2Al(s)+Cr2O2−7(aq)+14H+(aq)⟶2Al3+(aq)+2Cr3+(aq)+7H2O(l)