Question

What is the standard electrode potential of a copper electrode if it is combined with a zinc electrode in a galvanic cell, and the measured cell potential is 1.10 V at 298 K? Given: E°(Zn²⁺/Zn) = -0.76 V and E°(Cu²⁺/Cu) = 0.34 V.

Answer 1

In a galvanic cell, the standard cell potential  Ecell  is the difference between the standard electrode potentials of the two half-cells. The standard cell potential can be calculated using the Nernst equation:Ecell = E cathode  - E anode In this case, the copper electrode acts as the cathode, and the zinc electrode acts as the anode. The given standard electrode potentials are:E Cu/Cu  = 0.34 V  cathode E Zn/Zn  = -0.76 V  anode Now, we can calculate the standard cell potential:Ecell = 0.34 V -  -0.76 V  = 0.34 V + 0.76 V = 1.10 VThe measured cell potential is also given as 1.10 V, which matches the calculated standard cell potential. Therefore, the standard electrode potential of the copper electrode  E Cu/Cu   is 0.34 V.