AP EAMCET · Chemistry · Ionic Equilibrium
The \(\mathrm{pH}\) of a buffer solution formed by mixing \(30 \mathrm{~mL}\) of \(0.1 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}\) and \(30 \mathrm{~mL}\) of \(1 \mathrm{M}\) \(\mathrm{NH}_4 \mathrm{Cl}\) solutions is 8.6. The \(\mathrm{p} K_b\) of \(\mathrm{NH}_4 \mathrm{OH}\) is
- A 5.4
- B 4.4
- C 5.6
- D 4.2
Answer & Solution
Correct Answer
(B) 4.4
Step-by-step Solution
Detailed explanation
Given: \(\mathrm{pH}\) of mixture \(=8.6\) Also, \(\quad \mathrm{pH}=14-\mathrm{pOH}=14-8.6=5.4\) and \(\quad \mathrm{pOH}=\mathrm{p} K_b+\log \frac{[\text { Salt }]}{[\text { Base }]}\) Here, \(\quad[\) Salt \(]=\left[\mathrm{NH}_4 \mathrm{Cl}\right]=1 \mathrm{M}\) [Base…
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