organic chemistry

posted by .

chloroform is an excellent solvent for extraction caffeine from water. Kd = 10 for caffeine in chloroform- water at 25 Celsius. what weight of caffeine would be removed from a solution of 4g caffeine in 100ml water by a single extraction of 100 ml of chloroform?
for the situation in the uestion above, what total weight of caffeine could be rmoved by two extractions using 50 ml of chloroform each time?

  • organic chemistry -

    K(org/aq) = (grams/org solvent)/(g/aq solvent)

    10 = (x grams/100 mL)/(4-x grams/100 mL)
    Solve for x, then calculate 4-x to determine the amount left in the aqueous phase.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Why is caffeine only soluble in water that is strongly acidic?
  2. chem

    .070g caffeine dissolved in 4 mL water. caffeine is extracted from aqueous solution 3 times with 2mL portions of methylene chloride. calculate total amount of caffeine that can be extracted into the 3 portions. caffeine has a distribution …
  3. chem

    .070g caffeine dissolved in 4 mL water. caffeine is extracted from aqueous solution 3 times with 2mL portions of methylene chloride. calculate total amount of caffeine that can be extracted into the 3 portions. caffeine has a distribution …
  4. Biochemistry

    Hi, In this task for our school, we were requested to investigate a method for testing the amount of caffeine content in coffee. There are 3 main questions as fellows 1. What would be a good method to measure the amount of caffeine …
  5. organic chemistry lab

    chloroform is an excellent solvent for extraction caffeine from water. Kd = 10 for caffeine in chloroform- water at 25 Celsius. what weight of caffeine would be removed from a solution of 4g caffeine in 100ml water by a single extraction …
  6. chemistry

    Extraction of caffeine: You had extracted 2 g of crude caffeine and you were in a hurry. Instead of doing the 6 successive extractions with 2ml portions of methylene chloride, you only did 2 successive extractions with 6 ml portions …
  7. chem

    Extraction of caffeine: You had extracted 2 g of crude caffeine and you were in a hurry. Instead of doing the 6 successive extractions with 2ml portions of methylene chloride, you only did 2 successive extractions with 6 ml portions …
  8. Org Chem

    Caffeine has a distribuation coefficient of about 8 between Me Cl2 and water. Given 30ml of water containing 10 grams of caffeine. a. How much caffeine can be extracted with one 30mL portion of MeCl2?
  9. Organic Chemistry

    In a very controlled experiment, 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 …
  10. Organic Chemistry

    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 …

More Similar Questions