CAPE Chemistry Unit 2 · 2007 · Paper 2 · Question 4(b)(ii)
Explain how a buffer mixture of a weak acid and its salt maintains pH upon the addition of strong alkali.
The mark scheme is shown once you've answered.
Practise this questionOther parts of this question
- 4(a)Define the term 'buffer solution'.[2 marks]
- 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]
- 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]
- 4(c)(i)(b)Explain how breathing more deeply and quickly during exercise can reverse this effect.[4 marks]
- 4(d)(i)Write the expression for K_a of ethanoic acid.[1 mark]
- 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