Balancing complexHardQuestion 700013
Question
In the acidic permanganate-oxalate titration (KMnO₄ + H₂C₂O₄), the volume of 0.1 M KMnO₄ needed to react with 25 mL of 0.1 M H₂C₂O₄ is:
- A10 mLCorrect
- B25 mL
- C5 mL
- D50 mL
Correct answer
10 mL
Explanation
n-factor of KMnO₄ = 5 (Mn: +7→+2). n-factor of H₂C₂O₄ = 2 (C: +3→+4). meq of oxalate = 25×0.1×2 = 5 meq. meq of KMnO₄ = V×0.1×5 = 5 → V = 10 mL.