Did an experiment in Organic Chem Lab titled \"Isolation of Caffeine from Tea\"

Question

Did an experiment in Organic Chem Lab titled "Isolation of Caffeine from Tea" In the experiment, students had to isolate caffeine from tea leaves using a simplified Soxhlet extractor. The crude and purified caffeine obtained was analyzed by thin layer chromatography. A question from the packet asked,..

1) Give two reasons why the product is concentrated in the distillation flask during a continuous solid-liquid extraction. 2) what difficulties may be encounter during the determination of the melting point of caffeine? Did an experiment in Organic Chem Lab titled "Isolation of Caffeine from Tea" In the experiment, students had to isolate caffeine from tea leaves using a simplified Soxhlet extractor. The crude and purified caffeine obtained was analyzed by thin layer chromatography. A question from the packet asked,..

1) Give two reasons why the product is concentrated in the distillation flask during a continuous solid-liquid extraction. 2) what difficulties may be encounter during the determination of the melting point of caffeine?

Explanation / Answer

1) The product is concentrated in a distillation flask during the extraction because:

a) The product could have a boiling point higher than that of the solvent

b) or it could be a solid

2) Caffeine tends to sublime as it melts, this is why it is difficult to find its melting point.

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