Homework Help: o-chem

Posted by reba on Thursday, August 27, 2009 at 8:41pm.

300ml aq solution of 30g malononitrile extracted w/ether If K = 1.5 what results would be acheived from 3 100ml portions of ether...MORE importantly how do you work the problem..thanks

o-chem - DrBob222, Thursday, August 27, 2009 at 9:14pm
This is a partition coefficient problem. You need to make sure what K is. IF it is organic layer/aqueous layer, then the following applies.
f_n = [1 + K_d*(V_o/V_a)]^-n.
where f_n = fraction solute REMAINING in the water layer after n extractions, Vo = volume organic solvent and Va = volume aqueous layer. Post your work if you get stuck.
o-chem - reba, Sunday, August 30, 2009 at 12:46pm
what volume? sorry out of school for 30yrs! also 2nd part give soluability of 20/100ml in ether & 13.3g/100ml in water and the experiment is being done with 30g (mw 188.61) in 300ml of water to be extracted wih ether. I don't knwo how to proceed

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