CAIE A Level Chemistry 9701 · Electrochemistry
Compare the method used to measure the standard electrode potential of a non-metal in contact with its ions, for example chlorine in aqueous potassium chloride, with the method used to measure the standard electrode potential of ions of the same element in different oxidation states, for example and in aqueous solution. In your answer include: the electrode system used for each, the reference electrode used, and how the standard conditions are achieved.
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.