QuestionVolumetric analysis / permanganometry
The equivalence point of titration of oxalate solution (acidic medium) with KMnO₄ solution will be:
- (a) Pink
- (b) Colourless
- (c) Orange
- (d) Light green
Answer: (b) Colourless
At the equivalence point all MnO₄⁻ added has just been reduced to Mn²⁺ (nearly colourless) and all oxalate is used up → solution is colourless → (b). The end point is one drop later, when excess MnO₄⁻ gives a permanent light pink. Trap: equivalence point ≠ end point.