Gce Model Questions Vol1 2024 Chemistry Question 9
Practice essay / theory question 9 from the 2024 Gce Model Questions Vol1 Chemistry examination. This question covers Redox Reactions .
In an acidic solution, potassium permanganate (KMnO4) is used to oxidise ferrous ions (Fe2+) to ferric ions (Fe3+). The relevant standard reduction potentials at 25 °C are: MnO4⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O E° = +1.51 V Fe³⁺ + e⁻ → Fe²⁺ E° = +0.77 V (a) Write the balanced overall redox equation for the reaction. (b) Calculate the standard cell potential (E°cell) for the process. (c) State whether the reaction is spontaneous under standard conditions and justify your answer. (d) If 10.0 g of FeSO₄ (containing Fe²⁺) is to be completely oxidised in excess acid, calculate the mass of KMnO₄ required, assuming 100 % yield. (Molar masses: Fe = 55.85 g mol⁻¹, MnO₄⁻ = 118.94 g mol⁻¹).
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This is Gce Model Questions Vol1 2024 Chemistry Question 9. It is one of the essay questions from the 2024 Gce Model Questions Vol1 Chemistry examination.
The question covers Redox Reactions .
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