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Acetic acid’s pKa is 4.2 and ammonium hydroxide pKb is 3.24. What is the pH of the ammonium acetate solution?

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in Chemistry – Class 11 by (148k points)
Acetic acid’s pKa is 4.2 and ammonium hydroxide pKb is 3.24. What is the pH of the ammonium acetate solution?

(a) 7.12

(b) 7

(c) 4.2

(d) 7.48

The question was posed to me in examination.

My question is based upon Equilibrium in chapter Equilibrium of Chemistry – Class 11

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Right answer is (d) 7.48

Easiest explanation: We know that the pH of the solution of a weak acid and a weak base is given by 1/2pKW + 1/2pKa – 1/2pKb. So pH = 7 + \(\frac{1}{2}\)[4.2 – 3.24]; pH = 7 + 0.48 = 7.48, we get this by substituting acetic acid’s pKa as 4.2 and ammonium hydroxide  pKb as 3.24.

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