Aspirin that has been stored for a long time may give a vinegar odor and give a purple color with fecl3. what reaction would cause this to happen

Reaction of phenol with FeCl3 would give a purple color

Explanation:

Aspirin is essentially 2-acetoxy salicylic acid. Thus the chemical structure comprises a benzene ring along with 2 functional groups: a carboxylic acid (-COOH) and a acetoxy (-OCOCH3) group.

Hydrolysis of aspirin results in the cleavage of the acetoxy group to form CH3COOH acetic acid which gives a vinegar odor. Additionally this creates a phenolic structure (phenol group) which reacts with FeCl3 to give a purple color.

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the product of the pressure and volume is also constant