1 We used a vacuum pump with our rotary evaporator. How did this help the evapor

Question

1 We used a vacuum pump with our rotary evaporator. How did this help the evaporation of dichloromethane go quickly? 2. What was the purpose of using dry ice with the rotary evaporator? At what temperature does dry ice sublime directly into gaseous carbon dioxide? (You may need to consult a reference.) 3. A mixture of hexanes (C6H14) and ethyl acetate (CH3CO2CH2CH3) was used as a TLC developing solvent. Which compound do you think is likely to be more polar? Explain. 4. Would ethyl alcohol (ethanol) be a good substitute solvent for dichloromethane in in extracting caffeine from the aqueous solution? Explain. 5. Which compound has a greater solubility in water: ethanol or dichloromethane?

Explanation / Answer

1 - vaccum pump controls the vaccum levels in rotary evaporator. this react quickly to foaming conditions are keys to preserving your sample and using your time efficiently. it can also produce controlled vaccum which is used to bring solvent to boiling.

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