First slide

Basic Buffer

Question

Solution of 0.1 N NH₄OH and 0.1 N NH₄Cl has pH 9.25. Then p^K_^b of NH₄OH is

Moderate

A

9.25
B

4.75
C

3.75
D

8.25

Solution

P^OH of a basic buffer is given as,
$\large {P^{OH}} = {P^{{K_b}}} + \log \frac{{\left[ {salt} \right]}}{{\left[ {base} \right]}}$
⇒ 14 - 9.25 = $\large = {P^{{K_b}}} + \log \frac{{0.1}}{{0.1}}$
⇒ P^K_b = 4.75

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