Acetylsalicylic is readily available in Aspirin tablets. Chemically, it is a useful molecule. It can be converted to salicylic acid and then phenol, which is an extremely useful precursor.

This reaction can be used as a test for phenol groups. Mix several drops or a few crystals of compound to be tested in a beaker or in a 200mm test tube. Add a few drops of 1% FeCl3. As a control, add ...