organic chemistry

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I need to design a method to separate a mixture of benzoic acid and caffeine based on the results of a solubility experiment I did and Im not sure where to start. Ok, I know that the caffeine acts as a base as it was soluble in HCL and the Benzoic acid is an acid as it was soluble in NaOH. So I have to do an acid base reaction to separate the mixture. So if I react the mixture with an acid such as HCL, it will react with the caffeine. Will that separate the mixture?

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