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AIIMS 2001
Exam
AIIMS
Year
2001
Subject
Chemistry
Chapter
Ionic Equilibrium

AIIMS 2001 · Chemistry · Ionic Equilibrium

The pH of aqueous solution of ammonium formate is (p K_a. of...

The pH\mathrm{pH} of aqueous solution of ammonium formate is (pKa\left(\mathrm{p} K_a\right. of HCOOH=3.8\mathrm{HCOOH}=3.8 and pKb\mathrm{p} K_b of NH3=4.8)\left.\mathrm{NH}_3=4.8\right)

Options

  1. A7
  2. B6.0
  3. C6.5
  4. D8.9

Correct answer

C. 6.5

Step-by-step solution

For a salt of weak acid and weak base, its pH=\mathrm{pH}=7+12p\frac{1}{2} \mathrm{p}K_a-12p\frac{1}{2} \mathrm{p}K_b =7+12×\frac{1}{2} \times3.8-12×\frac{1}{2} \times4.8=6.5
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