Re-precipitation of Aspirin

Question

Knowing that carboxylic acids are reformed from their salts by the addition of a mineral acid, how can I show in an equation how aspirin is re-precipitated by reacting this with the solution acid?

Answer 1

Re-precipitation of Aspirin can be done by adding a diluted acid solution to a solution containing Acetyl salicylate. Acetyl salicylate is soluble in an aqueous solution since it is a polar/charged molecule and when adding milder acid carboxylate is going to convert into carboxylic acid. Acetyl Salicylic is not very soluble in aqueous solution like the salt so it's going to precipitate out form the solution.