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2 marksTitrimetric (Volumetric) Methods of Analysis

CAPE Chemistry Unit 2 · 2009 · Paper 2 · Question 2(c)(ii)

25 cm³ of barium chloride solution is precipitated by boiling with excess sodium carbonate containing 0.005 moles. Remaining sodium carbonate required 0.004 moles of HCl for neutralization.

Calculate the number of moles of Na2CO3 remaining after filtration.

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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(b)Use the example of barium chloride and sodium carbonate to explain the technique of back titration.[2 marks]
  4. 2(c)(i)Write the equation for the precipitation of barium ions.[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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