5. One hundred milligram of caffeine is dissolved in 50 mL of water.

Question

a. How many mg of caffeine will remain in the water if you extract with 20 mL of methylene chloride?
Show your calculations (KD = 4).b. How many mg of caffeine will remain in the water if you extract two times with 10 mL of methylene
chloride each? Show your calculations (KD= 4).

Answer 1

Kd = 4.0 = [(x/20)/(100-x)/50]
Solve for x = amount in the methylene chloride layer. 100-x is the amount in the water.