51(d) Calculate the standard electrode potential for the electrode Mn2 ,MnO4(-), H | Pt, if, with respect to a standard hydrogen electrode, the value of the potential E of this electrode (φ- (redox potential of the electrode) MnO4-, H | Mn2 under the following conditions is
С=(Mn2)=C(MnO4-)= 1 mol/l, pH=3, φ MnO4(-),Н |(Mn2( )=1.266V

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