Saturday 13 June 2009

"Shaving foam"

Decomposition of H2O2 :

To carry that experiment you need:

  • high buret
  • 30% hydrogen peroxide (perhydrol)
  • solid potassium or sodium iodide ( KI or NaI)
  • soap powder
BE CAREFUL! 30% HYDROGEN PEROXIDE IS VERY CORROSIVE!

Pour perhydrol into the buret (about 1/5 of its height), then pour the soap powder -
about 1 teaspoonful. Mix the soap with the liquid.

After that add 1/2 of teaspoonful of solid potassium iodide. Be carefull because foam appears very quickly and it could make some brown stain - it contains iodine I2 .

3H2O2 + KI = 3H2O + KIO + O2

2KIO + H2O2 = I2 + 2KOH + O
2


Oxygen causes a lot of foam if soap is mixed with perhydrol before adding KI.


http://www.youtube.com/watch?v=OKUgIKPPwhE

2 comments:

Unknown said...

Fantastic experiment(and a very good song)

Greetings from Spain

Claudia CZIPROK said...

This experiment is very spectacular. Good job! Congratulations Tymoteusz and Poland team!