Can you please help me understand this aspect of synthesizing aspirin reaction i

Question

Can you please help me understand this aspect of synthesizing aspirin reaction in detail: What is happening (chemically) when you add bicarbonate, then acid later? Help me understand this acid-based purefication. I know aspirin is acidic, but how does adding NaHCO3 react with it? Why do we then add the acid, what does that do? Does it have something to do with the soluability? Please help me understand!!!

COOH Reserve some SA Ac Acto for FeCl Test CHo OH H2SO4 catalyst Heat COOH ACO. OAC (ASA) impuities Add Hao Chill Vacuum Filter solution solid Perform F eC Test COOH OAc H2SO4 SA. OAC trace ASA impurities DISCARD Add aqueous NaHCO3 Gravity Filter solution solid COO Na impurities OAC DISCARD Acidify to pH

Explanation / Answer

aspirin is acidic therefore it will react with base like sodium bicarbonate to form salt which is soluble in aqueous solution therefore we are removing the non-aqueous impurity since the impuity are it is insoluble in water

later by adding acid to the sodium salt of aspirin,it will regenerate acid once again as pure insolube solid in aqueous solution and we can remove aqueous impurity.

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