[Steenrod]

How would you test the purity of [itex]CHCl_3[/itex]?
Thanks,I have no idea how to go about it.

[Hunter2]

What about gas chromatography GC or hoigh pressure liquid chromatography HPLC.

[Babcock_Hall]

This is not exactly an answer to your question, but commercial CHCl₃ often has stabilizers present.  Is that what your concern is?

[Steenrod]

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.

[Babcock_Hall]

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?

[Steenrod]

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...

[Babcock_Hall]

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

[Steenrod]

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.

[fledarmus]

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..."

[Steenrod]

You are right;please check your message inbox.