Isolation of Caffeine from Coffee Essay - 860 Words

------------------------------------------------- Isolation of Caffeine from Coffee Date of laboratory work: 10/9/2012 5:00-7:45 Date of report written: 10/15/2012 Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from the aqueous layer (upper). By using a rotary evaporator, it evaporates the organic solvent and forms the crude caffeine. Afterwards we used acetone-petroleum ether for recrystallization and the vacuum apparatus for filtration to obtain pure†¦show more content†¦A Hirsch Funnel was used to filter the crystals and weigh them. Then the weight percentage of caffeine isolated from the ground coffee’s weight was calculated. At last the melting point for the recrystallized caffeine was measured. (Reference: Organic Chemistry Laboratory Manual) Equation: Weight Percentage (%) =Weight of solulteWeight if solution*100 % Chemical Structures: Calcium carbonate Calcium carbonate Dichloromethane Dichloromethane Caffeine Caffeine (Reference: 1.http://www.caffeine.com/ 2. http://www.coastalwiki.org/coastalwiki/Dichloromethane 3. http://en.wikipedia.org/wiki/File:Calcium_carbonate.png) Data: Chemical Name | Caffeine | Water | Calcium carbonate | Dichloromethane | Magnesium sulfate | Acetone | Petroleu m ether | MolecularFormula | C8H10N4O2 | H2O | CaCO3 | CH2Cl2 | MgSO4 | C3H6O | C6H14 | Molecular weight | 194.2 | 18.02 | 100.1 | 84.93 | 120.4 | 58.08 | 86.18 | # of moles | | 13.87 | .05994 | 1.253 | | | | State of matter | Solid/ powder | Liquid | Solid | Liquid | Solid | Liquid | Liquid | Density (g/mL) | 1.23 | 1.00 | 2.93 | 1.33 | | 0.791 | 0.650 | MP/BP | 236.5-234/- | 0/100 | 825-856/1339 | -97/40 | | -94/57 | -/46-60 | Theoretical Yield | | | | | | | | Amount | | 250 mL | 6.0 g | 80 mL | | | | Hazards |Show MoreRelatedCaffeine Lab Report769 Words   |  4 PagesIsolation of a Natural product, in the experiment caffeine [C8H10N4O2], is based on a series of procedures. 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