Caffeine Report

In: Science

Submitted By venacherry
Words 612
Pages 3
This experiment is designed to introduce students to the use of another separation technique, which is the solvent extraction. In this experiment you will isolate a compound from a natural source. You will extract caffeine from the tealeaf by using both solid-liquid and liquid-liquid extractions.

Caffeine is a natural product found in coffee, tea, soft drinks, and chocolate. The tea and coffee leaves are composed of approximately 4% of caffeine. Caffeine can also be isolated from natural sources. Extraction is a chemical method of separating a specific component of a solution from the rest of the solution. Caffeine was chosen in this experiment because caffeine is relatively easy to extracts from tea leaves. The reasons are there is approximately 5% of caffeine by weight of dry tea leaves, which is a large amount for a natural product. And the bulk of the tea leaf consists mostly of cellulose, which is a water-insoluble polymer of glucose. Caffeine is also soluble in both hot water and dichloromethane.
In this experiment, all caffeine dissolves in the tea when the tea leaves are extracted with boiling water, which is the first extraction. The second extraction uses dichloromethane to separate the caffeine from the polar inorganics in the water.
This is done two times; therefore, there is a minimal amount of caffeine left in the discarded tea. Sodium sulfate will serve to absorb the small amount of water from the combined dichloromethane. When all dichloromethane is evaporated, there is only caffeine left as a solid residue.

PROCEDURE: 1.Obtain 150 mL of tea solution from your laboratory instructor. 2. Transfer the tea solution from the beaker to the separatory funnel 3. Add 30 mL of dichloromethane to the separatory funnel. Mix the two layers by using a…...

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