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Topic: Decomposition of H2O2  (Read 2820 times)

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Offline eRReR

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Decomposition of H2O2
« on: November 08, 2011, 06:23:01 PM »
I was trying to perform the Elephant's Toothpaste reaction (decomposition of H2O2 with KI). I added a scoop of KI to the H2O2 and it instantly turned red. I didn't notice any decomposition giving off O2, and I'm in a school lab where some of the chemicals are dated. Should I be worried about anything? Could someone help me figure out why the H2O2 turned red?
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Offline Borek

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Re: Decomposition of H2O2
« Reply #1 on: November 09, 2011, 02:48:54 AM »
Red sounds like elemental iodine.
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Offline AWK

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Re: Decomposition of H2O2
« Reply #2 on: November 09, 2011, 06:11:32 AM »
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Offline eRReR

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Re: Decomposition of H2O2
« Reply #3 on: November 12, 2011, 07:10:16 PM »
No, it wasn't 30%. It was a jug of 3%, but I would guess that the bottle is over 5 years old, at least.
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