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In a lab, we seperated Excedrin (paracetamol, acetylsalicylic acid, caffeine, and binder). First we dissolved the...

In a lab, we seperated Excedrin (paracetamol, acetylsalicylic acid, caffeine, and binder). First we dissolved the powder in diethyl ether. This seperated the mixture into caffeine/acetylsalicylc acid and binder/paracetamol. K2HPO4 was added to the caffeine/acetylsalicylic acid. Give the reaction mechanism for K2HPO4 + caffeine and K2HPO4 + acetylsalicylic acid. HCl was then added to K2HPO4 + acetylsalicylic acid. Give this reaction mechanism.

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K2HPO4 (aq) HPO42(aq) HO-p Addition of K2HPO4 to a mixture of Caffeine and acetylsalicylic acid HO No Reaction caffeine ac etyls alicylate acetylsalicylic acid On addition of K2HPO4 i.e. HPO4to a mixture of Caffeine and Acetylsalicylic acid a moderate base HPO2 abstract carboxylic proton from Acetylsalicylic acid and crresponding cojugate base acetylslicylate goes into aqueous phase Whereas the moderately basic Caffeine wont show any reaction with HPO4 and remains in non-aqueous phase Then carefully two layes are separated and to aqueous layer HCl is added which protonates carboxylate group and give acetylsalicylic acid solid form back Hence the way to achieve Caffeine and acetylsalycylic acid separation O + HCl он Aqueous Phase Acetylsalicylic acid back

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