An iron key is electroplated with silver by the electrolysis of a silver nitrate solution (AgNO3AgNO_3AgNO3) using a pure silver anode.
Write the half-equation for the formation of a silver atom from a silver ion at the cathode.
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.