Electrochemistry (A Level)

You will be able to

• Calculate a standard cell potential by combining two standard electrode potentials.
• Deduce the polarity of each electrode and the direction of electron flow in the external circuit.
• Predict the feasibility of a reaction and write the overall equation from the two half-equations, using ΔG° = −nE°cellF.

You will be able to

• Predict qualitatively how an electrode potential changes when the concentration of its aqueous ions changes.
• Use E = E° + (0.059 ÷ z) lg([oxidised] ÷ [reduced]) to calculate an electrode potential, with the substitution shown.
• Explain why E° applies only at 1.00 mol dm⁻³, and see how an electrode potential moves the free-energy change (an extension of ΔG° = −nE°cellF).