An industrial chemist electroplated a steel key with nickel using a nickel sulfate solution. The steel key acted as the cathode and a pure nickel strip acted as the anode.
Table 1 shows the mass of the nickel anode and the steel key cathode before and after the electrolysis process had run for 45 minutes.
Table 1
| Anode (nickel strip) | Cathode (steel key) | |
|---|---|---|
| Mass before electrolysis / g | 18.76 | 12.34 |
| Mass after electrolysis / g | 16.21 | 14.68 |
Calculate the mass of nickel deposited onto the steel key.
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.