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3 marksPhase Separations

CAPE Chemistry Unit 2 · 2012 · Paper 2 · Question 5(b)(iv)

A solution of 10.0 g of an ester, Y, in 100 cm3 of water was shaken with 200 cm3 of ether. After separation, the aqueous solution was found to contain 1.6 g of Y. Calculate the partition coefficient of Y between ether and water.

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  1. 5(a)State the names and functions of the pieces of apparatus shown in Figure 2 and Figure 3.[5 marks]
  2. 5(b)(i)Write an equation to explain the term 'partition coefficient' or 'distribution coefficient' using the example of an ester dissolved in a mixture of water and…[1 mark]
  3. 5(b)(ii)State TWO factors which affect the value of the partition coefficient.[2 marks]
  4. 5(b)(iii)Explain the principles of solvent extraction with respect to the recovery of an organic compound from an aqueous solution.[4 marks]

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