Complete and label the diagram to show how the standard cell potential, $E^\circ_{\text{cell}}$, for the reaction above can be measured under standard conditions.
Calculate the $E^\circ_{\text{cell}}$ for this reaction using the Data Booklet.
What colour change would you observe when chlorine gas is bubbled through a solution containing $\text{Fe}^{2+}(aq)$ ions until the reaction is complete?
Predict the effect, if any, of decreasing the concentration of $\text{Cl}^-(aq)$ on the size of the cell potential in a(i). Explain your answer.
A fuel cell is an electrochemical cell used to generate electrical energy. In the alkaline hydrogen-oxygen fuel cell, $\text{H}_2(g)$ and $\text{O}_2(g)$ are supplied to two inert electrodes dipped in an alkaline solution. Write the half-equations for the reactions occurring at each of these electrodes. Hydrogen electrode ................. Oxygen electrode .................
Construct the equation for the overall reaction.
Suggest one possible advantage of a hydrogen-oxygen fuel cell compared with a conventional ‘simple cell’ battery.