Calculate the pH of a mixture of 0.8 M carboxylic acid (COOH) and0.3 M carboxyla

Question

Calculate the pH of a mixture of 0.8 M carboxylic acid (COOH) and0.3 M carboxylate ion (COO-). The pka ofcarboxylic acid is 2.76. Please show work and please explainit if you can I really need to understand how to do this. Thanks

Explanation / Answer

           COOH          =>         COO-   +      H+ initial      0.8                                 0.3            0 change    -x                                  +x                +x equil       0.8 -x                         0.3 +x             x Ka = 10-pKa = 10-2.76 = 0.00173780083 =[H+][COO-]/[COOH] 0.00173780083 = x*(0.3 + x)/(0.8 - x) Assume x

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