Quelpr
4 marksTitrimetric (Volumetric) Methods of Analysis

CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 4(c)(i)(b)

The carbonic acid-bicarbonate buffer system controls blood pH according to: CO2(aq) + H2O(l) <=> H2CO3(aq) (Equation 1) and H2CO3(aq) <=> H+(aq) + HCO3-(aq) (Equation 2).

Explain how breathing more deeply and quickly during exercise can reverse this effect.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 4(a)Define the term 'buffer solution'.[2 marks]
  2. 4(b)(i)Explain how a buffer mixture of a weak acid and its salt maintains pH upon the addition of strong acid.[3 marks]
  3. 4(b)(ii)Explain how a buffer mixture of a weak acid and its salt maintains pH upon the addition of strong alkali.[3 marks]
  4. 4(c)(i)(a)During periods of strenuous exercise, carbon dioxide builds up in the blood. Explain the effect of this build-up on the buffer system with reference to…[2 marks]
  5. 4(d)(i)Write the expression for K_a of ethanoic acid.[1 mark]
  6. 4(d)(ii)Use the K_a expression to calculate the pH of the buffer solution.[5 marks]

More practice: the rest of this paper · more Titrimetric (Volumetric) Methods of Analysis questions · all CAPE Chemistry Unit 2 past papers