A technician is calibrating an industrial electrorefining cell by measuring how the mass of a nickel cathode changes during the electrolysis of nickel(II) sulfate solution.
Before the electrolysis is started, the initial mass of the nickel cathode must be measured.
Explain how the nickel cathode should be prepared before its initial mass is 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.