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2 marksTitrimetric (Volumetric) Methods of Analysis

CAPE Chemistry Unit 2 · 2009 · Paper 2 · Question 2(b)

Back titration of barium chloride using sodium carbonate.

Use the example of barium chloride and sodium carbonate to explain the technique of back titration.

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Other parts of this question

  1. 2(a)(i)Define the term 'Equivalence point'.[1 mark]
  2. 2(a)(ii)Define the term 'End point'.[1 mark]
  3. 2(c)(i)Write the equation for the precipitation of barium ions.[2 marks]
  4. 2(c)(ii)Calculate the number of moles of Na2CO3 remaining after filtration.[2 marks]
  5. 2(c)(iii)Deduce the number of moles of BaCl2 which reacted with the sodium carbonate solution.[1 mark]
  6. 2(c)(iv)Calculate the concentration of barium ions in mol dm⁻³.[1 mark]
  7. 2(d)(i)List FOUR steps a student must follow to successfully standardize a solution of potassium manganate(VII) by titration using an oxalic acid solution.[4 marks]
  8. 2(d)(ii)Identify the indicator in the titration in (d)(i).[1 mark]

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