A student investigates how the mass of the anode changes during the electrolysis of copper(II) sulfate solution using copper electrodes.
Before the electrolysis is started, the initial mass of each copper electrode must be measured.
Explain how the copper electrodes should be prepared before their initial masses are determined.
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.