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1 markAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2005 · Paper 1 · Question 6(a)(i)

The pKa values of ethanoic acid and ethanol are 4.76 and 15.9 respectively.

State the meaning of the term pKa.

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Other parts of this question

  1. 6(a)(ii)Explain the significance of the given pKa values.[2 marks]
  2. 6(a)(iii)Describe the features of EACH of the organic molecules that account for the difference in pKa values.[2 marks]
  3. 6(b)(i)Give the displayed formula of L-threonine in an acidic solution.[2 marks]
  4. 6(b)(ii)Explain why L-threonine has a high melting point and is soluble in water.[3 marks]

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