Dear friend
                                                                     Â
[g/100 mL] in organic phase
                      Â
Partition coefficient (K)
=Â Â Â Â Â Â Â Â
----------------------------------------------------
                                                                     Â
[g/100 mL] in aqueous phase
The partition coefficient of caffeine in dichloromethane/water
is 9.0. it means for every 100 mL 90 mg caffeine goes into
dichloromethane and 10 mg goes into water.
A. One extraction using 200 mL of
dichloromethane ------Â Â 10 mg remains
because 90 mg goes into 200 mL dichloromethane
B. Two extractions using 100 mL of
dichloromethan each ------Â Â Â nothing
remains because first 100 mL takes 90 mg then next 100 mL
takes 10 mg into dichloromethane.
Thank you.
