university chemistry

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this is for a chemistry laboratory experiment called "how much caffeine is there in instant coffee"

What should be the pH of the aqueous layer to extract caffeine? There are three aqueous solutions that you may choose from.

A. pH >14, using 2.5 M NaOH (aq)
B. pH 1, using 0.1 M HCl (aq)
C. pH 6.2, using 0.1 M NaHCO3 (aq)

note: caffeine does not gain or lose protons in aqueous solution at these pH values

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