(a)[1]
Give the name applied to any solution that undergoes electrolysis.
(b(i))[2]
Complete the ionic half-equation for this reaction. $[BLANK]OH^-(aq) \rightarrow [BLANK] + O_2(g) + 4e^-$
(b(ii))[1]
Explain how the ionic half-equation shows that the hydroxide ions are oxidised.
(c)[1]
Describe what the student sees at the cathode.
(d)[2]
Write the ionic half-equation for the reaction at the cathode.
(e(i))[2]
Describe what the student observes at: • the cathode • the anode.
(e(ii))[2]
State the colour observed in the solution. Give a reason for your answer.
(f)[1]
State another element that could be used in place of carbon.