A sample of molten potassium iodide is electrolysed using inert electrodes. At the anode, a student writes the following half equation:
2I−→I2+e−\mathrm{2I^{-} \rightarrow I_{2} + e^{-}}2I−→I2+e−
Explain why this half equation is not balanced and write the balanced half equation.
The student then electrolyses aqueous potassium iodide using inert electrodes. Predict whether the same balanced half equation applies at the anode and explain your answer.
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.