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April 19, 2014

Homework Help: chem 12

Posted by Sarah on Tuesday, October 11, 2011 at 2:03pm.

a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5.

b) Calculate the per cent ionization of the HC7H5O2.

I got..

Kb = [HC7H5O3][OH]/HC7H5O2

6.3x10^-5 x Kb =1.0x10^-14
Kb = 1.0x10^-14/6.3x10^-4 = 1.5x10^-10

1.5x10^-10 = (x)(x)/0.15

i'm not sure where i got from there.

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