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8 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 7(b)(i)

Amphetamine, like A, is an amine. It is a drug that increases the heart rate and causes increased sweating in humans. Its structure is given below: [Structure of Amphetamine provided]

Explain the differences in basic character of A, ammonia and amphetamine. In your explanation make reference to the molecular features of each molecule. State the order of INCREASING basic character of the three molecules.

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Other parts of this question

  1. 7(a)(i)For the reaction sequence given above, state the reagents and conditions needed for Reactions I and II.[4 marks]
  2. 7(a)(ii)Identify ONE OTHER product that could be obtained in Reaction I by changing the conditions. State the condition(s) needed.[2 marks]
  3. 7(b)(ii)Write an equation to show the basic nature of any ONE of the above substances.[1 mark]
  4. 7(b)(iii)The pKa of A is 9.62. Suggest how the pKa of amphetamine and ammonia should vary relative to that of A.[2 marks]
  5. 7(c)(i)Predict pH values for difluoroethanoic acid and dibromoethanoic acid.[2 marks]
  6. 7(c)(ii)Would benzoic acid be a stronger or weaker acid than ethanoic acid?[1 mark]

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