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Explain why 1,2-dichloroethane is a good solvent for extracting caffeing from tea in water. Comment on...

Explain why 1,2-dichloroethane is a good solvent for extracting caffeing from tea in water. Comment on solubility of caffeine and other tea compounds.

Explain why methylene chloride is not used in this experiment

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Answer #1

Cafeine is less polar compound which is soluble in 1,2-dicholorethane, hence it is used for extraction.

For extractions, the solvent should have a relatively low boiling point for easy removal by evaporation; and it should not react with any of the substances present (unless you are performing an acid-base extraction).

In liquid-liquid extraction, the compound being extracted should have a favorable distribution coefficient in the extracting solvent; in liquid-solid extraction, the solvent must dissolve the compound being extracted.

Methylene chloride is carcinogenic. It can also form side product with caffeine.

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