Consider a typical liquid-liquid extraction procedure: a. Measure out 20 mL of 0
ID: 541747 • Letter: C
Question
Consider a typical liquid-liquid extraction procedure:
a. Measure out 20 mL of 0.005 M iodine-potassium using a graduated cylinder
b. Use a funnel to transfer the solution to your separatory funnel.
c. In a fume hood or under a snorkel, measure out 20 mL of your organic solvent using a graduated cylinder.
d. Carefully add the organic solvent to the separatory funnel without mixing. Note which layer is on top and which layer is on the bottom. Record any observations.
e. Stopper the separatory funnel and shake it gently, venting frequently. Continue until there is no more color change.
f. Let the mixture sit in the ring clamp until the two layers have fully separated then remove the organic layer. (Note: This process will differ depending on which solvent you are working with.)
g. Once the organic layer has been removed, combine another 20 mL of your organic solvent with the aqueous layer. Again, stopper the funnel, shake, let it sit, and remove the organic layer.
h. Combine your second organic layer with the first layer you removed.
i. Once the organic layer has been removed, combine a final 20 mL of your organic solvent with the aqueous layer. Again, stopper the funnel, shake, let it sit, and remove the organic layer. j. Combine your third organic layer with the first two.
(a) What is the E-factor if the solvent is dichloromethane? State any assumptions.
(b) If the goal is to recover the iodine, what additional steps are required.
Explanation / Answer
Answer,
The solvent which is having the more density is the bottom layer. The extracting organic solvent becomes as a top layer.
E factor is the relationship between the ratio of product produced and wastage.