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1 markBuffers and pH

CAPE Chemistry Unit 1 · 2008 · Paper 2 · Question 5(e)

When preparing a buffer solution of a specific pH, state ONE consideration to be taken into account in selecting a suitable weak acid.

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  1. 5(a)(i)With reference to the Bronsted-Lowry theory, explain EACH of the following: Weak acid[2 marks]
  2. 5(a)(ii)With reference to the Bronsted-Lowry theory, explain EACH of the following: Strong acid[1 mark]
  3. 5(b)Describe the significance of pH (- log [H⁺]) and Kₐ (acid dissociation constant) values.[2 marks]
  4. 5(c)Calculate the pH of the HC₃H₅O₃ / C₃H₅O₃⁻ buffer solution.[4 marks]
  5. 5(d)With the aid of balanced equations, explain how the HC₃H₅O₃ / C₃H₅O₃⁻ buffer works in maintaining its pH.[6 marks]

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