What is meant by the term standard electrode potential, SEP?
Draw a fully labelled diagram of the apparatus that could be used to measure the SEP of the $\text{Fe}^{3+}/\text{Fe}^{2+}$ electrode.
The reaction between $\text{Fe}^{3+}$ ions and $\text{I}^-$ ions is an equilibrium reaction: $2\text{Fe}^{3+}(aq) + 2\text{I}^-(aq) \rightleftharpoons 2\text{Fe}^{2+}(aq) + \text{I}_2(aq)$.
Use the Data Booklet to work out the $E^\circ_{cell}$ for this reaction.
Hence state, with a reason, whether there will be more products or more reactants at equilibrium.
Write the expression for $K_c$ for this reaction, and state its units.
An experiment used solutions of $\text{Fe}^{3+}(aq)$ and $\text{I}^-(aq)$ that had the same concentration. $100\,\text{cm}^3$ of each solution were combined and left until equilibrium was reached. The equilibrium concentrations of $\text{Fe}^{3+}(aq)$ and $\text{I}_2(aq)$ were: $[\text{Fe}^{3+}(aq)] = 2.0 \times 10^{-4}\,\text{mol dm}^{-3}$, $[\text{I}_2(aq)] = 1.0 \times 10^{-2}\,\text{mol dm}^{-3}$. Use these data, together with the equation given in (c), to calculate the concentrations of $\text{Fe}^{2+}(aq)$ and $I^-(aq)$ at equilibrium.
Calculate the $K_c$ for this reaction.