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Topic: phenol test with ferric chloride  (Read 3291 times)

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Offline researcher

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phenol test with ferric chloride
« on: April 01, 2010, 10:37:44 PM »
I know the solution is supposed to turn purple, but it became kinda grey/brown, I can´t find an explanation anywhere...can anyone help me?
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Offline onn

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Re: phenol test with ferric chloride
« Reply #1 on: April 02, 2010, 05:52:38 PM »
Quote from: researcher on April 01, 2010, 10:37:44 PM
I know the solution is supposed to turn purple, but it became kinda grey/brown, I can´t find an explanation anywhere...can anyone help me?

iron(III) oxide is rust and brown-ish. Perhaps there is a redox with oxygen in the air, especially after leaving the mixture to stand in air for some time.
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