Calculate the percent dissociation of 0.40 M benzoic acid, C6H5COOH. (Ka = 6.3 x 10^-5) ___%?
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Chemistry
Calculate the percent dissociation of 0.40 M benzoic acid,C6H5COOH. (Ka = 6.3 x 10^-5)
___%?
Calculate the percent dissociation of 0.40 M benzoic acid,C6H5COOH. (Ka = 6.3 x 10^-5)
___%?
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Dear friend your answer is
% Dissociation
                    C6H5COOH(aq)   +           H2O(l)    <===>     C6H5COO-(aq)     +            H3O+(aq)
I (M)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â .40Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ---Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0
C(M)                     -x                           ---                                          +x                          +x
E(M)                     .40-x                     ---                                             x                             x
Ka = 6.3 x 10 – 5= (x)(x)/(0.40 -x)
Approximation: 0.40 -x ~ 0.40
so x = 0.0050199 M
(x/0.40)*100% = (0.0050199/.40)*100% = 1.2549 %
Percent dissociation 1.2549 %
Thank you
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