CAIE A Level Chemistry 9701 · Equilibria
A student shakes a mixture of water and hexane with two different solutes, P and Q, separately. Solute P is polar and solute Q is non-polar. Compare the values of the partition coefficient, , of P and Q in the water–hexane system, and explain the factors that determine the numerical value of a partition coefficient.
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.