I need help with the following questions. Any help would beappreciated. (b) A co

Question

I need help with the following questions. Any help would beappreciated.

(b) A compound distributes between water (solvent 1) and benzene(solvent 2) with Kp = 2.7. If 1.0g of the compound were dissolvedin 100mL of water, how much compound could be extracted by THREE10-mL portions of benzene?

(c) If the value of Kp is 0.5 for the distribution of a compoundbetween pentane (solvent 2) and water (solvent 1), and equalvolumes of the two solvents were used, how many extractions of theaqueous layer will be required to recover at least 90% of thecompound?

(d) Calculate the % of a compound that can be removed from liquidphase 1 by using ONE to FOUR extractions with a liquid phase 2.Assume that Kp = 2 and the volume of phase 2 equals to 50% that ofphase 1.

(e) A slightly polar organic compound distributes between diethylether and water with a partition coefficient equal to 3 (in favorof the ether). What simple method can be used to increase thepartition coefficient? Explain.

Explanation / Answer

b)

Kp = [(1.0-x)/ 10]/[x/ (100)] =2.7
Kp = [(1/28-x)/ 10]/[x/ (100)] =2.7
Kp = [([1/28]^2-x)/ 10]/[x/ (100)] =2.7
x=(1/28)^3 g

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