During the electrolysis of a pink cobalt(II) sulfate solution using cobalt electrodes, the anode decreases in mass, the cathode increases in mass, and the intensity of the pink colour of the solution remains constant.
Explain each of these three observations.
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.