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4 marksPhase Separations

CAPE Chemistry Unit 2 · 2013 · Paper 2 · Question 5(b)

When butanedioic acid was shaken with a mixture of water and ether, 10 cm³ of water contained 0.854 g of the acid while a similar volume (10 cm³) of ether contained 0.159 g. In a separate experiment, 10 cm³ of water and 20 cm³ of ether were shaken together with 1 g of the acid. Calculate the mass of the acid found in the aqueous layer at equilibrium.

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  1. 5(a)Define the term 'partition coefficient'.[2 marks]
  2. 5(c)(i)Suggest an appropriate separation technique to separate eucalyptus oil from an aqueous suspension of its leaves.[1 mark]
  3. 5(c)(ii)Suggest an appropriate separation technique to isolate penicillin (organic solid) from an aqueous solution.[1 mark]
  4. 5(c)(iii)Suggest an appropriate separation technique to separate the components of a coal tar residue.[1 mark]
  5. 5(c)(iv)Suggest an appropriate separation technique to purify ethoxyethane from an impure source.[1 mark]
  6. 5(d)Use the boiling point-composition phase diagram in Figure 6 to explain the principles of fractional distillation, starting with a liquid mixture of composition…[5 marks]

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