The p K a of acetic acid and p K b of N H 4 O H are 4.75 and 4.75 respectively. Find the pH of ammonium acetate solution?

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Question: Answered & Verified by Expert

The

p K_{a}

of acetic acid and

p K_{b}

of

N H_{4} O H

are 4.75 and 4.75 respectively. Find the pH of ammonium acetate solution?

ChemistryIonic EquilibriumJEE Main

Solution:

2372 Upvotes Verified Answer

The correct answer is: 7

Ammonium acetate is a salt of weak acid and weak base.

So pH is given as

p H = \frac{1}{2} (p K_{w} + p K_{a} - p K_{b})

= \frac{1}{2} (14 + 4.75 - 4.75)

= 7

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