Here is a sample problem.

You have a mixture of p-chloroaniline and benzoic acid, dissolved in dichloromethane.

To extract p-chloroaniline only, what aqueous solution will you use?

Answer:You may use 5% HCl aqueous solution.

Add 5% HCl

Reset

Did you see that you extracted the amine as a salt form, and benzoic acid remained in the organic layer?

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Organic Web Chem University of Alberta