An organic base (b) has a pka of 6.950 and a partition coefficient, between water and ether, of 3.0. the organic base is extracted from 225 ml of a 0.175 m aqueous solution of b, that has been adjusted to a ph of 8.00, with 75.5 ml of ether. only one extraction is performed. calculate the concentration of the organic base (b) in the water phase after the extraction.

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5 structural isomers

the isomers are:

n-exane :   ch3ch2ch2ch2ch2ch3

2-methylpentane :   ch3ch(ch3)ch2ch2ch3

3-methylpentane :   ch3ch2ch(ch3)ch2ch3

2,3-dimethylbutane :   (ch3)2chch(ch3)2

2,2-dimethylbutane :   (ch3)3cch2ch3