Question

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possible reason for this ?

Answer 1

For the calculation of E° (M²⁺/M) values, three energies are responsible. They are ionisation energies, sublimation energies and hydration energies. In case of copper, the values of ionisation energies and sublimation energies are higher while the value of hydration energy is low hence E° (M²⁺/M) value for copper is positive (+ 0.34 V).