Homework Help: chemistry

Posted by Anonymous on Sunday, November 15, 2009 at 8:35pm.

The question asks, "Butanoic acid has a partition coeff of 3.0 when distributed b/t water and benzene. Find the formal concentration of butanoic acid in each phase when 100 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at pH 10.00."

I know that the first step is to find D, where D = K(Ka)/[(Ka+[H+)].

So I calculated:
D = 3.0(1.52x10^-5)/[(1.52x10^-5+10^-10)].

The answer should have been D = 1.97 x 10^-5, but I didn't get this.

Please help!

chemistry - DrBob222, Sunday, November 15, 2009 at 8:54pm
If the question is worded correctly, then K_{d water/benzene} = 3.0
chemistry - DrBob222, Sunday, November 15, 2009 at 9:23pm
However, the distribution coefficient USUALLY is listed as organic/water.
chemistry - Anonymous, Sunday, November 15, 2009 at 10:15pm
So how do I correct my mistake?

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