8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟ layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you use ethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane as the extraction solvent)? Explain why or why not.
8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟ layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you use ethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane as the extraction solvent)? Explain why or why not.
Chapter80: Crystallization: Purification Of Solids
Section: Chapter Questions
Problem 4P
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Question
Extraction of Caffeine Post-lab
8. Ethanol is miscible with water. (After all, alcoholic beverages don t separate into an “alcohol‟
layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you use
ethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane as
the extraction solvent)? Explain why or why not.
layer” and a “water layer.”) Assuming that caffeine is soluble in ethanol, could you use
ethanol as a solvent to extract caffeine from coffee (rather than using dichloromethane as
the extraction solvent)? Explain why or why not.
9. A 12 oz can of Coke contains 46 mg of caffeine. One fluid ounce is equivalent to 29.57 mL
(1 oz = 29.57 mL). What is the concentration of caffeine in Coke, in units of mg/mL? Show
your work.
10. What is an alkaloid?
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