Quelpr
4 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · May/June 2022 · Paper 2 · Question 2(a)(iii)

Module 2: Kinetics and Equilibria. Acid-base behavior of extracted liquid from ants (pH 4.2).

Twenty cm^3 of a solution with the same pH as the extracted liquid is titrated with 1 x 10^-4 mol dm^-3 aqueous sodium hydroxide. Sketch the titration curve that will be obtained.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)(i)Define the term 'pH'.[1 mark]
  2. 2(a)(ii)Calculate the hydrogen ion concentration of the colourless liquid with pH 4.2.[2 marks]
  3. 2(a)(iv)Using Table 3 showing pH ranges of indicators, suggest with reasons which indicator is the most suitable for use in the titration in (iii).[3 marks]
  4. 2(b)(i)Define the term 'rate of reaction'.[2 marks]
  5. 2(b)(ii)Explain how catalysts and surface area affect the rate of a chemical reaction.[4 marks]
  6. 2(c)(i)Use ONLY the data in Table 4 to determine the order of reaction with respect to S2O8^2- and I^-.[4 marks]
  7. 2(c)(ii)Based on your answer in (c)(i), determine the overall order of the reaction.[1 mark]
  8. 2(c)(iii)Determine the rate law for the reaction.[2 marks]
  9. 2(d)(i)Define the term 'standard electrode potential of a half cell'.[2 marks]
  10. 2(d)(ii)Draw a labelled diagram to show how the standard electrode potential of the Fe3+(aq)/Fe2+(aq) half cell can be determined.[5 marks]

More practice: the rest of this paper · more Acid/Base Equilibria questions · all CAPE Chemistry Unit 1 past papers