CAIE A Level Chemistry 9701 · Equilibria
A student has two beakers. Beaker A contains 0.1 mol dm⁻³ hydrochloric acid, . Beaker B contains 0.1 mol dm⁻³ ethanoic acid, . The student adds a few drops of universal indicator to each beaker. Compare the expected colours and the pH values of the two solutions, and explain the reason for the difference.
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.