A student electrolyses aqueous potassium bromide and aqueous copper nitrate using inert electrodes. The ions present in each solution are shown below.
| Solution | Ions present |
|---|---|
| Potassium bromide | K⁺, Br⁻, H⁺, OH⁻ |
| Copper nitrate | Cu²⁺, NO₃⁻, H⁺, OH⁻ |
Compare the products formed at the cathode and anode in the two solutions. Explain your answer.
76 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1a The process of electrolysis, 4.3.1b Half equations in electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations. Each one has a worked solution and a mark scheme showing where the marks go.