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Modified over 2 years ago
Somervale School, Midsomer Norton, Bath 7 th January 2009
The experiment we completed was
1. Safety precautions were taken, glasses and coat!
2. We boiled 5 tea bags in a beaker using a hot plate.
3. This equipment is called Buchner filtration. We attached it to taps to create suction.
5. We filtered our stewed tea to remove any bits.
6. I cooled down the filtrate using an ice bowl.
7. I added the solution to a separating funnel with an organic solvent.
8. We shook the funnel and released the gas, pointing at the wall.
9. I ran off the bottom layer of solution containing the caffeine and dichloromethane solvent.
10. I used a rotary evaporator to leave the solid in my flask. Expensive machine!
11. This is our caffeine.
12. I scraped out the solid caffeine.
13. We tested the purity on a melting point machine.
14. Caffeine extracted.
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