A student extracted the active ingredient from several analgesic over-the-counter drugs to determine the composition of each one. Based on the label he tested all the drugs to see if they contain acetaminophen (ACE), aspirin (ASP) and caffeine (CAF). However, he forgot to label which spot corresponds to which drug. Shown below is the TLC plate the student obtained from his experiment after extraction from Anacin®, Tylenol®, Vivarin® and Excedrin® and using 2% acetic acid and 98% ethyl acetate as the mobile phase.
