Question

1) Calculate the partition coefficient of caffeine in water/methylene
chloride from the following data: 10.3 g/100 mL for methylene
chloride and 2.04 g/100 mL for water.
2. A student is sure that
0.500 grams of caffeine is dissolved in 125 mL of water. The student extracts the caffeine using a single extraction of 21 mL of methylene chloride. How much caffeine is in the methylene chloride? How much remains in the water?
3. Using the same data from #1, a student follows the procedure and extracts the caffeine using 3 extractions of 7 mL of methylene chloride. How much caffeine is in the combined 21 mL of methylene chloride? How much remained in the water?

Answer 1

So far I got kp=5.05 and I think b would be 0.49? Please help with steps, I am so confused!

Answer 2

http://www.jiskha.com/display.cgi?id=1414729583