Expt 02 - Isolation of Caffeine from Vivarin

Expt 02 - Isolation of Caffeine from Vivarin - EXPERIMENT...

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EXPERIMENT TWO EXTRACTION OF CAFFEINE FROM VIVARIN Caffeine is an alkaloid found in tea, coffee, cola nuts, and several other plants. It is a mild stimulant and may be used medically for this purpose (for example, in Vivarin tablets). Structurally, caffeine belongs to a class of nitrogen bases called purines. It is a colorless, crystalline solid that melts at 235-236 E C, but it can readily be sublimed under reduced pressure at temperatures below its melting point. It is moderately soluble in water (2.2g/100mL) but is more soluble in common organic solvents. One technique that you will use during this lab is called multiple extraction. When we separate the caffeine from the alkaline water we will use three 20 mL portions of methylene chloride instead of a single 60 mL portion. If the caffeine is twice as soluble in the methylene chloride as it is the the water then three 20 mL portions will extract about 20% more caffeine from the water than a single 60 mL portion of methylene chloride. CHEMICALS
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Expt 02 - Isolation of Caffeine from Vivarin - EXPERIMENT...

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