Chemistry lab report

Topics: Chemistry, Caffeine, Tea Pages: 3 (556 words) Published: November 20, 2013

Department of Chemistry
Extraction and Sublimation
Experiment #4


Caffeine is a stimulant found in tea, coffee, cocoa, OTC medication, and cola drinks.It stimulates the brain and the central nervous system, so that a person feels less tired and more alert. The purpose of this lab is to determine the amount of caffeine in tea. The major component of tea is cellulose which is a polymer of glucose. Materials

Lab coat
Graduated cylinder
1 tea bag (1.615g)
50 mL beaker
Hot plate
500 mL Erlenmeyer flask
30 mL DI water
Wash glass

In this experiment the caffeine is extracted from tea leaves by hot water. From the aqueous extract the caffeine is isolated by multiple extractions with small portions of dichloromethane. In a 500 mL Erlenmeyer flask we placed one tea bag, which weighed 1.615g, along with 30 mL of DI water, and 2 grams of powdered calcium carbonate. After boiling the mixture gently for 20 minutes, occasionally swirling it, the hot solution is allowed to cool and the caffeine is then extracted from the water with dichloromethane, which is an organic solvent that is insoluble in water. The next step was to transfer the tea extract from the 500 ml Erlenmeyer flask to a 125 ml separate funnel that is supported by a ring on a ring stand. We added 15 mL’s of DCM to the funnel and shaken the solution gently three times to release any pressure that may have built up in the funnel. There were two different layers. We drained the lower (DCM) layer into a 50 mL beaker. We stored the beaker and resumed the experiment a week later. The next week we took out the beaker and boiled it on a hot plate. During this process we covered the beaker with a wash glass that was filled with ice. After it had boiled we recovered the caffeine on the wash glass.

After finishing up the experiment a week later, we were able to retrieve some caffeine on the...

Bibliography: Wilcox/Wilcox, Experimental Organic Chemistry, Chapter 8.3 and 9.7B, pages 97-98, pages 117-118
Rodriguez, Victor (2010, May 5). The Isolation of Caffeine from Tea. Retrieved from:
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • guide to writing research reports Essay
  • Essay on Lab Report
  • Chemistry Lab Report Essay
  • Chemistry lab report Essay
  • Essay on chemistry report
  • Lab report Essay
  • Banana Oil Lab Report Essay
  • Lab report Essay

Become a StudyMode Member

Sign Up - It's Free
Ame-iro Cocoa: Side G Episode 2 | A Força de Grayskull: A História de He-Man e os Mestres do Universo Assistir A Força de Grayskull: A História de He-Man e os Mestres do Universo 720p Dublado/Legendado Online Este documentário mostra as origens e o impacto de He-Man, o personagem que inspirou muito mais do que uma linha de brinquedos e um desenho animado. Ver filme A Força de Grayskull: A História de He-Man e os Mestres do Universo Dublado/Legendado Ver Filme Power of ... | 2007 / 2008