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November 01, 2025, 12:23:26 pm
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Author Topic: Colours of substances  (Read 587 times)  Share 

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NE2000

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Colours of substances
« on: September 15, 2009, 07:23:36 pm »
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Alright, basically I was doing a chem paper and they said an electrolytic cell formed a red-brown colour around one electrode and it asked what was being formed. So what coloured substances should we be able to identify by colour?
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Gloamglozer

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Re: Colours of substances
« Reply #1 on: September 15, 2009, 07:30:39 pm »
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Red-brown is iron I think.
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Re: Colours of substances
« Reply #2 on: September 15, 2009, 07:31:15 pm »
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From memory, pretty much just that one. The bromine test is something you should've learnt about either in a textbook or a prac. Flame colours (e.g. sodium yellow, chlorine green etc) might also be tested but I don't recall there ever being a question on it.
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NE2000

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Re: Colours of substances
« Reply #3 on: September 15, 2009, 07:38:34 pm »
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CuSO4 is blue, I think we're meant to know that.

The bromine test decolourizes unsaturated hydrocarbons that's all good but I don't think they'll ask that or the flame colours in Unit 4.

By the way the answer was bromine forming...
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shinny

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Re: Colours of substances
« Reply #4 on: September 15, 2009, 07:40:30 pm »
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Quote from: NE2000 on September 15, 2009, 07:38:34 pm
CuSO4 is blue, I think we're meant to know that.

The bromine test decolourizes unsaturated hydrocarbons that's all good but I don't think they'll ask that or the flame colours in Unit 4.

By the way the answer was bromine forming...

Oh yes, you're in unit 4 now. And well yeh, I guess copper sulfate is another standard one. Still can't recall any other common ones though. If you've been paying attention in pracs, you should be fine though.
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