[UOIT]

Assuming the following values, calculate how much caffeine should be obtained  if we have the following : 20 mL for the water layer with 25 mg of caffeine in it before extraction and we did a extraction of 2 x 6 mL for the CH2Cl2 layers. 

Kp(CH2Cl2/water) = 3.0;

[Yggdrasil]

Please read the Forum Rules.  You should that show you've at least attempted to answer the problem before we will help you.

Do you know the definition of Kp?  Try to start with that and figure out how much caffeine is extracted during the first 6mL extraction.

[UOIT]

I figure it out without the help of the so call  "smart people" of this forum 

[hion]

thanks!