First slide

Ionization constants of weak bases, PH of weak bases

Question

The ${pK}_{a}$ of acetic acid and ${pK}_{b}$ of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

Moderate

A

4.765
B

5.012
C

7.005
D

6.098

Solution

$pH = 7 + \frac{1}{2} [{pK}_{a} - {pK}_{b}] = 7 + \frac{1}{2} [4.76 - 4.75]$
$= 7 + \frac{1}{2} [0.01] = 7 + 0.005 = 7.005$

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