Potassium Permanganate Colour Change

Discoloration of the solution of potassium permanganate

Scientific name: Oxidation of potassium permanganate

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Safety

Wear eye protection goggles.

Always follow general safety recommendations. Please note that conducting chemistry experiments you must comply with the relevant legal procedures in your country.

Reaction formula

5 H2O2 + 2 KMnO4 + 3 H2SO4 → 5 O2 + K2SO4 + 2 MnSO4 + 8 H2O

Step-by-step instruction

  1. Prepare a solution of potassium permanganate, the concentration should be moderate so that the solution is slightly pink and moderately transparent.
  2. Prepare a solution of hydrogen peroxide and sulfuric acid of any reasonable concentration.
  3. Slowly pour the solution of potassium permanganate into the acidic solution of hydrogen peroxide.
  4. Watch bleaching of the solution of potassium permanganate.

Scientific background

This process is a combination of two reactions. On the one hand, this is an ordinary redox reaction, on the other hand, there is a catalytic disproportionation of hydrogen peroxide in the presence of potassium permanganate.

The release of oxygen is due to the occurrence of the catalytic disproportionation of the unstable peroxide oxygen. Discoloration of potassium permanganate is due to its reduction to manganese sulfate.

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Published on 13 June 2015

  • Fire
  • Heating with fire
  • Explosion
  • Poisoned gas
  • Organic
  • Electricity
  • Solution
  • Oxidation reduction
  • Color change
  • Precipitate
  • Gassing
  • Catalyst