CAIE A Level Chemistry 9701 · Equilibria
Two beakers contain equal volumes and equal concentrations of hydrochloric acid, , and ethanoic acid, . Small pieces of magnesium ribbon are added to each. State and compare the observations made, and explain the difference in behaviour in terms of dissociation and pH. Use the Brønsted–Lowry theory in your explanation.
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.