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Caffeine Extraction Experiment at Somervale School: Year 9 Triple Science Aspirations Day

Join us in this exciting experiment conducted at Somervale School in Midsomer Norton, Bath. Discover the process of extracting caffeine from tea bags using the Buchner filtration technique, and testing its purity using a melting point machine.

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Caffeine Extraction Experiment at Somervale School: Year 9 Triple Science Aspirations Day

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  1. Somervale School, Midsomer Norton, Bath 7th January 2009 Year 9Triple Science Aspirations DayUniversity of Bristol

  2. The experiment we completed was The extraction of caffeine

  3. 1. Safety precautions were taken, glasses and coat!

  4. 2. We boiled 5 tea bags in a beaker using a hot plate.

  5. 3. This equipment is called Buchner filtration. We attached it to taps to create suction.

  6. 4. Filtering

  7. 5. We filtered our stewed tea to remove any bits.

  8. 6. I cooled down the filtrate using an ice bowl.

  9. 7. I added the solution to a separating funnel with an organic solvent.

  10. 8. We shook the funnel and released the gas, pointing at the wall.

  11. 9. I ran off the bottom layer of solution containing the caffeine and dichloromethane solvent.

  12. 10. I used a rotary evaporator to leave the solid in my flask. Expensive machine!

  13. 11. This is our caffeine.

  14. 12. I scraped out the solid caffeine.

  15. 13. We tested the purity on a melting point machine.

  16. 14. Caffeine extracted.

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