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JIPMER 2013
Exam
JIPMER
Year
2013
Subject
Chemistry
Chapter
Ionic Equilibrium

JIPMER 2013 · Chemistry · Ionic Equilibrium

p K_a of acetic acid and p K_b of ammonium hydroxide are 4.76 and...

pKa\mathrm{p} K_a of acetic acid and pKb\mathrm{p} K_b of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

Options

  1. A6.02
  2. B7.005
  3. C8
  4. D5.602

Correct answer

B. 7.005

Step-by-step solution

pH=7+12[pKa−pKb]=7+12[4.76−4.75]=7+12×0.01=7+0.005=7.005\begin{aligned} \mathrm{pH}=7+ & \frac{1}{2}\left[\mathrm{p}^{K_a}-\mathrm{p}^{K_b}\right] \\ & =7+\frac{1}{2}[4.76-4.75] \\ & =7+\frac{1}{2} \times 0.01=7+0.005 \\ & =7.005\end{aligned}
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