Homework Help: chemistry

Posted by carol on Sunday, February 13, 2011 at 3:20pm.

Suppose that a compound Z had a partition coefficient of 8 in ether-water. If 10g of z was dissolved in 100mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions

a) what is the total amount of z contained in 200mL of ether extract after the two extractions?

b) if instead of using two 100 mL portions of ether a single extraction had been carried out using one 200 mL portion of ether what weight of Z would be contained in the ether solution under these conditions?

chemistry - DrBob222, Sunday, February 13, 2011 at 7:47pm
a)
K = 8 = (z/100)/(10/100)
Solve for z for the first extraction, subtract from 10 to determine the amount left in the aqueous phase, then repeat the extraction.
b) is done the same way.
chemistry - environmental engineer, Thursday, October 4, 2012 at 11:07pm
I think you're wrong bob.

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