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1 markThe Mole Concept

CAPE Chemistry Unit 1 · 2006 · Paper 1 · Question 7(c)(iv)

25.0 cm³ of the aqueous solution of M requires 24.80 cm³ of 0.02 mol dm⁻³ permanganate for complete reaction. The equation for the reaction is: 5 Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5 Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O

Calculate the mass of Fe²⁺ in 1 dm³ of M (aq).

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  1. 7(a)State THREE characteristics of ethanedioic acid that make it a suitable primary standard.[3 marks]
  2. 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]
  3. 7(c)(i)Calculate the number of moles MnO₄⁻ used.[1 mark]
  4. 7(c)(ii)Calculate the number of moles Fe²⁺ in the 25.0 cm³ of aqueous M.[1 mark]
  5. 7(c)(iii)Calculate the number of moles Fe²⁺ in 1.0 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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