Igcse Model Questions Vol1 2021 Chemistry Question 9

Practice essay / theory question 9 from the 2021 Igcse Model Questions Vol1 Chemistry examination. This question covers Redox Reactions .

Igcse Model Questions Vol1 2021 Chemistry Essay / Theory
Topic: Redox Reactions
Question 9 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • essay

In an acidic solution potassium permanganate (KMnO₄) is used to oxidise oxalic acid (H₂C₂O₄·2H₂O). The reaction is carried out at 25 °C. You are required to:

Question Parts

( a )
Write the balanced overall redox equation for the reaction between KMnO₄ and oxalic acid in acidic medium.
( b )
A sample of 0.50 g of oxalic acid dihydrate (H₂C₂O₄·2H₂O) is to be completely oxidised. The KMnO₄ solution available has a concentration of 0.020 mol L⁻¹. Calculate the volume of KMnO₄ solution required (in millilitres). Show all steps of your calculation.
( c )
Explain why the reaction must be carried out in an acidic medium. Include in your answer the role of H⁺ ions in the half‑reaction and the effect on the oxidation state of manganese.

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Igcse Model Questions Vol1 2021 Chemistry Question 9. It is one of the essay questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.

The question covers Redox Reactions .

View More Igcse Model Questions Vol1 2021 Chemistry Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support