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Lenka Lenka
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11 years ago
CO2 is a nonpolar compound that is used to dissolve caffeine, another nonpolar compound.

Once the caffeine is dissolved in the CO2, how can you recover the caffeine?
a. by forcing the CO2 back through the solution that contained the caffeine
b. by lowering the temperature and pressure of the CO2
c. by changing the polarity of the caffeine molecules
d. by using a harsher solvent

Please help. I have no idea what the right answer is.
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wrote...
#1
11 years ago
Polarity is an intensive property, so no. But you can change the polarity of a system, in this case a solution, so D. is the answer. The system needs to be more polarized to make the caffeine extractable.
wrote...
#2
11 years ago
Supercritical CO2 is used as the solvent.  All you need to do to remove it is cool it off and drop the pressure.

Step b.
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