Calculate the pH of ammonium formate solution given and . | Ionic Equilibrium — Chem-Mantra

Question

Calculate the pH of $0.01 \text{ M }$ ammonium formate solution given $pK_a(HCOOH) = 3.8$ and $pK_b(NH_3) = 4.8$.

Answer: A

💡 Solution & Explanation

Ammonium formate is a WA-WB salt. $pH = 7 + \frac{1}{2}pK_a - \frac{1}{2}pK_b = 7 + \frac{1}{2}(3.8) - \frac{1}{2}(4.8) = 7 + 1.9 - 2.4 = 6.5$.

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