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How To Demonstrate the Chameleon Redox Reaction with a Lollipop

How To Demonstrate the Chameleon Redox Reaction with a Lollipop

In this video, Paul Cook shows how to demonstrate the manganate (VII) reaction, also to referred as the Chameleon Redox Reaction using a lollipop.

Ideal for A-Level Chemistry students, this self-indicating redox titration demonstration is a creative and engaging way to introduce this fundamental concept.

In redox reactions, there is a simultaneous occurrence of oxidation (loss of electrons) and reduction (gain of electrons). The specific example provided involves potassium permanganate and sugar.

 

You will need:

  • Chupa Chups lollipop (other brands of lollipop are available!)
  • Electric milk foamer
  • Sodium Hydroxide Solution 0.1M
  • Potassium permanganate (VII) 0.02g
  • Distilled water
  • 2 x Beakers
  • Stirring rod (optional)
  • Safety goggles
  • Lab coat
  • Chemical resistant gloves

 

Method:

    1. Start by preparing the Potassium Permanganate solution and the Sodium Hydroxide solution.
    2. Secure the Chupa Chups lollipop to the electric milk foamer. Ensure it is firmly attached and won’t come off during the experiment.
    3. Mix the Sodium Hydroxide solution and Potassium Permanganate solution together using the stirring rod to start the demonstration
    4. Start the electric milk foamer to initiate the redox reaction. The foamer’s movement will help in the mixing and reaction between the lollipop (sugar) and potassium permanganate.
    5. Observe any colour changes or reactions occurring between the lollipop and potassium permanganate. Note the transformation in colours as the reaction progresses.
    6. Discuss the observed changes, emphasising the redox nature of the reaction, where potassium permanganate acts as the oxidising agent and the sugar in the lollipop undergoes oxidation.
    7. Dispose of the used lollipop and any remaining chemicals appropriately. Rinse the beakers and the electric milk foamer for future use.

 

All health and safety measures are the responsibility of the teacher doing the demonstration. A thorough risk assessment should be carried out and guidance procedures followed. It is suggested that you practice before demonstration in front of a class.

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