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3 marksThe Mole Concept

CAPE Chemistry Unit 1 · 2006 · Paper 1 · Question 7(a)

To estimate the % of Fe²⁺ in compound M, a solution of M is titrated against a standard solution of potassium permanganate (manganate (VII)). The permanganate is standardised by titration against the primary standard, ethanedioic acid.

State THREE characteristics of ethanedioic acid that make it a suitable primary standard.

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Other parts of this question

  1. 7(b)In preparing the solution of ethanedioic for titration against the permanganate, two pieces of laboratory equipment with a high degree of accuracy are…[2 marks]
  2. 7(c)(i)Calculate the number of moles MnO₄⁻ used.[1 mark]
  3. 7(c)(ii)Calculate the number of moles Fe²⁺ in the 25.0 cm³ of aqueous M.[1 mark]
  4. 7(c)(iii)Calculate the number of moles Fe²⁺ in 1.0 dm³ of M (aq).[1 mark]
  5. 7(c)(iv)Calculate the mass of Fe²⁺ in 1 dm³ of M (aq).[1 mark]
  6. 7(c)(v)Calculate the % Fe²⁺ in the compound [The mass concentration of M is 40.90 g dm⁻³].[1 mark]

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