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Topic: Purity of CHCL_3  (Read 2974 times)

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Offline Steenrod

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Purity of CHCL_3
« on: November 13, 2012, 01:51:05 PM »
How would you test the purity of [itex]CHCl_3[/itex]?
Thanks,I have no idea how to go about it.
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I am horrible at chemistry.I am always liable to fail my chemistry exams.So, sorry for stupid questions.

Offline Hunter2

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Re: Purity of CHCL_3
« Reply #1 on: November 13, 2012, 02:34:38 PM »
What about gas chromatography GC or hoigh pressure liquid chromatography HPLC.
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Offline Babcock_Hall

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Re: Purity of CHCL_3
« Reply #2 on: November 13, 2012, 05:13:27 PM »
This is not exactly an answer to your question, but commercial CHCl3 often has stabilizers present.  Is that what your concern is?
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Offline Steenrod

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Re: Purity of CHCL_3
« Reply #3 on: November 13, 2012, 10:41:54 PM »
Since it is a question from a school paper,I think they want a chemical process which works theoretically.Either way, I am having a lot of difficulty understanding how to go about it.
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I am horrible at chemistry.I am always liable to fail my chemistry exams.So, sorry for stupid questions.

Offline Babcock_Hall

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Re: Purity of CHCL_3
« Reply #4 on: November 14, 2012, 08:36:11 AM »
To some degree the best method to look for an impurity depends upon the impurity.  What would the gas chromatograms of a pure versus impure CHCl3 look like?  What would the H-1 NMR spectra look like?
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Offline Steenrod

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Re: Purity of CHCL_3
« Reply #5 on: November 14, 2012, 09:49:56 AM »
Topics like NMR spectra were not taught at school.So I cannot use it. :(

The only thing that comes to my mind is chloroform test;but I do not know why.

Perhaps,an indirect chemical method...
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I am horrible at chemistry.I am always liable to fail my chemistry exams.So, sorry for stupid questions.

Offline Babcock_Hall

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Re: Purity of CHCL_3
« Reply #6 on: November 14, 2012, 10:21:07 AM »
Are you familiar with gas chromatography at all?  That seems to be the method used in this link:
http://www.anachemiachemicals.com/pdfs/split_34.pdf
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Offline Steenrod

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Re: Purity of CHCL_3
« Reply #7 on: November 14, 2012, 12:14:24 PM »
No,i am not familiar with gas chromatography.It is not in the syllabus and I will not get any credit in the exam if I give a solution based on it.

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I am horrible at chemistry.I am always liable to fail my chemistry exams.So, sorry for stupid questions.

Offline fledarmus

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Re: Purity of CHCL_3
« Reply #8 on: November 14, 2012, 12:59:45 PM »
Elemental Analysis?

If that doesn't work, I'm afraid you're going to have to tell us what IS in your syllabus. Right now we're playing a game of "Guess what number I'm thinking of...nope...nope...nope..."
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Offline Steenrod

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Re: Purity of CHCL_3
« Reply #9 on: November 14, 2012, 01:17:32 PM »
You are right;please check your message inbox.
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I am horrible at chemistry.I am always liable to fail my chemistry exams.So, sorry for stupid questions.
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