Determined from the separation between peak potentials:

Problem:

Suggest how eq could be employed to determine the number of electrons n involved in a reversible reaction at a microelectrode.

Answer:

The number of electrons transferred in the electrode reaction (n) for a reversible couple can be determined from the separation between peak potentials.

?E_p = ^Ep_a - ^Ep_c =   0.059/n

Thus, for a one-electron process such as the reduction of [Fe^III(CN)₆]^3-  to [Fe^II(CN)₆]^4-  exhibits ? E_p of 0.059 V. So, by knowing ? E_p the number of electrons n involved in a reversible reaction at a microelectrode can be determined.