Data reference—Standard electrode potentials

Standard electrode potential tables list reduction potentials under standard conditions. Choose the cathode reduction, reverse the anode half-equation, and calculate E°cell = E°cathode − E°anode.

A positive E°cell indicates a thermodynamically feasible direction under standard conditions. More positive reductions correspond to stronger oxidising agents; the reverse couples identify reducing strength.

If Cu²⁺/Cu has a more positive E° than Zn²⁺/Zn, Cu²⁺ can oxidise Zn in a standard cell, giving a positive E°cell.

Do not multiply E° values by stoichiometric coefficients, and do not treat standard feasibility as a guarantee under arbitrary concentrations.