AQA · OCR A · Year 13
Concentration, pressure and electrode potential
Change a half-cell away from standard conditions and predict what happens to the actual electrode potential. Use the redox equilibrium to make the A-level qualitative prediction.
E versus E° lab
Move the equilibrium, then predict E
Standard and non-standard conditions
Use E° for standard conditions and E for the conditions present
A standard electrode potential, E°, is defined for standard conditions. Dilution, concentration changes or gas-pressure changes move the half-cell equilibrium and therefore change the actual electrode potential, E. The tabulated E° value remains fixed.