Question 10.7: Determine the pKa for acetic acid, HC2H3O2, given that Ka fo......

General, Organic, And Biological Chemistry [1102665]

Determine the $pK_{a}$ for acetic acid, $HC_{2}H_{3}O_{2}$ , given that $K_{a}$ for this acid is 1.8 × $10^{-5}$ .

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Because the $K_{a}$ value is 1.8 × $10^{-5}$ and $pK_{a}$ = -log $K_{a}$ , we have
$pK_{a}$ = -log(1.8 × $10^{-5}$ ) = 4.74
The logarithm value 4.74 was obtained using an electronic calculator, as explained in
Example 10.5.

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