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A 20 mL sample of H2O2 solution reacts completely with 80 mL of 0.05 M KMnO4 solution in acidic medium. What is the volume strength of the H2O2 solution?
- 2.8
- 5.6
- 11.2
- None of these
Correct answer: 11.2
Solution
Reaction in acidic medium: 2KMnO4 + 5H2O2 + 3H2SO4 -> 2MnSO4 + K2SO4 + 5O2 + 8H2O. n-factor of KMnO4 = 5 (Mn: +7 to +2). n-factor of H2O2 = 2 (O: -1 to 0). Meq of KMnO4 = 0.08 L * 0.05 mol/L * 5 = 0.02 equivalents. Meq of H2O2 = 0.02 eq. Moles of H2O2 = 0.02/2 = 0.01 mol. Molarity of H2O2 = 0.01/0.02 = 0.5 M. Volume strength = 11.2 * Molarity = 11.2 * 0.5 = 5.6. Wait, let me recheck — volume strength = 5.6 volume.
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