Question

If $pK_a$ of acetic acid and $pK_b$ of ammonium hydroxide are $4.76$ each. The $pH$ of ammonium acetate is

• A. 7
• B. less than 7
• C. more than 7
• D. zero.

Answer 1

Answer: (A)

7

Answer 2

pH of a salt of weak acid and weak base is
${pH = 7 +\frac{1}{2}p}K_{a}-\frac{1}{2}{p}K_{b}$
${pH = 7 + \frac{1}{2} \times 4.76 - \frac{1}{2} \times 4.76}$