Produce a fully labelled diagram showing how the standard electrode potential, $E^\circ$, for $\text{X}^{2+}(\text{aq})/\text{X}(\text{s})$ may be determined.
Which conditions must be satisfied for the measured value to count as a standard electrode potential?
State which charge carriers pass current through the solutions and through the wire.
An electrochemical cell was assembled from an $\text{X}^{2+}(\text{aq})/\text{X}(\text{s})$ half-cell ($E^\circ = -0.40\,\text{V}$) and an $\text{Ag}^+(\text{aq})/\text{Ag}(\text{s})$ half-cell ($E^\circ = +0.80\,\text{V}$). Write an equation for the reaction that would occur when the electrodes of this cell are connected by a wire.
While current flowed for a time, the Ag electrode increased in mass by $1.30\,\text{g}$ and the electrode made of metal X decreased in mass by $0.67\,\text{g}$. Calculate the $A_r$ of metal X, hence suggest an identity for X. Show all your working. The Data Booklet may be used in this question.