... to extracting the caffeine, also the run time could have been increased to optimise caffeine extraction. It was also noticed that when treating the solution with dichloromethane bubbling of the aqueous layer occurred. This could have caused the aqueous layer to remain in the organic layer. This would have affected the purity of the sample in the end and making the separation step ... non-polar C18 column. The calibration curve was also successful. However an error in the some data points caused a curve in the line. Inaccuracies in the making up of this solution may be attributed to this...

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• Grade Level: High School

... . Physical Properties: Molecular weight 194.19 Boiling point is.178 degrees C Melting point is 238 degrees C It is extremely soluble in supercritical fluid carbon dioxide and somewhat soluble in water; aqueous solutions of caffeine quickly break down. Physical features: in solid form it is white in color and is prism-like crystals. It has no odor - it is odorless. Summary Of ... consumption (VO2) and carbon dioxide production (VCO2) were measured by indirect calorimetry (measurement of the amount of heat evolved or absorbed in a chemical reaction, change of state, or formation of a solut...

• Word Count: 1220
• Approx Pages: 5
• Grade Level: High School