Caffeine is a natural product belonging to a group of compounds called alkaloids. No-Doz contains 100 mg per tablet. It stimulates respiration, the heart and the central nervous system, is a smooth muscle relaxant and a diuretic. It is also addicting.
Hot water swells the tea leaves to release caffeine and other compounds such as tannins.
Na 2 SO 4 to remove traces of water. The CH 2 Cl 2 is removed by evaporation to give crude caffeine. Finally the caffeine is purified by recrystallization with ethyl acetate. Use a 30 mL beaker as a plunger to release the tea into the aqueous solution. Allow it to extract the tea for 3 min.