QI Money shot

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Dr Jekyll

Original Poster:

23,820 posts

267 months

Saturday 5th October 2013
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In QI last night Stephen Fry poured 'something' into a flask of hydrogen peroxide and created an impressive amount of foam. I thought he said the hydrogen peroxide was mixed with a small amount of detergent but didn't say what he poured in. Or perhaps it was the detergent he poured in to pure hydrogen peroxide. Does anyone know?

marshalla

15,902 posts

207 months

Saturday 5th October 2013
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A catalyst of some description - like this : https://imaginationstationtoledo.org/content/2010/...

Nimby

4,842 posts

156 months

Saturday 5th October 2013
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I thought he said potassium iodide.

Mr.Chips

1,030 posts

220 months

Saturday 5th October 2013
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Yes, he did say potassium iodide.

grumbledoak

31,759 posts

239 months

Dr Jekyll

Original Poster:

23,820 posts

267 months

Saturday 5th October 2013
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Thanks.

ThunderGod

41 posts

134 months

Monday 14th October 2013
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Here's a YouTube link to it being done by someone else (for anyone who didn't see it on QI):
<url>http://youtu.be/p1eG2y2mn54</url>
I've done it at a school I used to work it. If you get the mixture right and do it in the right sort of container (large conical flask works best), the foam will shoot 12-15 feet in the air. Since the bubbles are oxygen, if you get in quick enough after the start of the reaction, and throw in a lit splint, you can light the oxygen and make the foam appear to glow.


Simpo Two

86,718 posts

271 months

Monday 14th October 2013
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ThunderGod said:
you can light the oxygen
I'm having a chemistry fail here... if burning something needs oxygen... then if you are trying to light oxygen what is it combining with?

Flibble

6,485 posts

187 months

Monday 14th October 2013
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Simpo Two said:
I'm having a chemistry fail here... if burning something needs oxygen... then if you are trying to light oxygen what is it combining with?
Magic!

But really, you're right oxygen doesn't burn.

FurtiveFreddy

8,577 posts

243 months

Monday 14th October 2013
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I think what happens is the splint burns more fiercely and the light from it makes the rest of the bubbles 'glow'.

FurtiveFreddy

8,577 posts

243 months

Monday 14th October 2013
quotequote all
I think what happens is the splint burns more fiercely and the light from it makes the rest of the bubbles 'glow'.