Find the pH of a 0.14M CH3COOH solution. Ka= 1.8x 10^-5

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Chemistry

Find the pH of a 0.14M CH3COOH solution. Ka= 1.8x 10^-5

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4.3 Ratings (806 Votes)

                 CH3COOH + H2O -----------> CH3COO- + H3O+

      I          0.14M                                       0                  0

      C          -x                                             +x                +x

      E         0.14-x                                       +x                  +x

                               Ka = [CH3COO-][H3O+]/[CH3COOH]

                              1.8*10-5   = x*x/0.14-x

                              1.8*10-5 *(0.14-x) = x2

                                    x   = 0.00157M

                      [H3O+]   = x   = 0.00157M

                      PH    = -log[H3O+]

                               = -log0.00157

                               = 2.8041


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