CAIE A Level Chemistry 9701 · Electrochemistry
Two electrolytic cells are set up. Cell 1 contains molten sodium chloride. Cell 2 contains dilute aqueous sodium chloride. Both are electrolysed using inert platinum electrodes. Compare the products formed at the anode and cathode in each cell, explaining the reasons for any differences. Describe how the electrolysis of the molten sodium chloride could be used to determine a value of the Avogadro constant, .
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.