FWS – Chemical Chameleon Reaction

The chemical chameleon reaction is a two step reaction in which you can visualise various oxidation states of manganese starting with potassium permanganate (+7) and ending with manganese dioxide (+4). The reaction is performed in alkaline conditions using caster sugar as a reduction agent. In the first step of this reaction, the purple potassium permanganate is being reduced down to the green manganate ion. A mixture of these two compounds gives the solution a blue colour.

MnO4- + e- → MnO4-2

Next, the manganate ion is further reduced to manganese dioxide which is an orange colour.

MnO4-2 + 2H2O + 2e- → MnO2 + 4OH-

Safety
Potassium permaganate is a strong oxidiser and may cause fire when in contact with other materials. May be harmful if swallowed, and may cause severe respiratory tract irritation with possible burns. Causes severe eye and skin irritation. Causes severe burns and gives out heat when added to water. Always wear gloves when handling these two chemicals.Materials and Equipment

Materials and Equipement

  • Potassium permanganate
  • Sodium Hydroxide
  • Caster sugar

Experimental Procedure

  • Add a few potassium permanganate crystals to 5ml of water. Agitate until dissolved. The more concentrated the solution the less likely you will be able to see the colour change from purple to green, but the orange manganese dioxide will be more visible.
  • To 100ml of water, add 1.5g of sodium hydroxide and 1g of caster sugar. Agitate the soultion until both have dissolved.
  • Add a small amount of the potassium permanganate solution to the caustic sugar solution and agitate.
About Myles Power (757 Articles)
Hello Internet! My name is Myles Power and I am a chemist from the North East of England, who loves to make videos trying to counter pseudoscience and debunk quackery in all of its various forms! From the hype around GMOs through to Atrazine turning the freakin’ frogs gay, I’ll try to cut through the nonsense that’s out there!

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