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Question

pka of acetic acid and pKb of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.
  1. 6.02
  2. 7.005
  3. 8
  4. 5.602

A
7.005
B
8
C
5.602
D
6.02
Solution
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Ammonium acetate is a salt of weak acid, acetic acid and weak base, ammonium hydroxide.
When weak acid and base is given in a mixture, the pH of ammonium acetate is calculated as:

pH=7+12(pkapkb)

pH=7+12(4.764.75)=7.005

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