Procedure
Isolation of caffeine from tea leaves
Soilid-liquid Extraction: Obtain one tea bag from your TA and record its weight. Note 
that the average weight of empty bag is~0.2g. Place the bag inside a 100 ml beaker 
(leaving the label outside). Add ~0.8 g of calcium carbonate and 15 ml of water. Add a 
boiling chip, cover the top of the beaker with a 70 mm watch glass and bring the solution 
to a gentle boil on a hot plate. Boil for 20 minutes while stirring it gently from time to 
time with a glass rod. Allow the solution to cool to room temperature and then remove 
the bag from the solution. Gently squeeze the bag on the sides of the beaker with glass 
rod to allow removal of maximum solution from the bag. Be careful not to puncture the 
bag while doing this