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  • Calculate the the pH of a 0.01M NH4OH solution containing 10 mol/litre of NH4Cl? (pKb = 4.76)  Option

Calculate the the pH of a 0.01M NH4OH solution containing 10 mol/litre of NH4Cl?
(pKb = 4.76)

 

Option: 1

8.24(1)is correct


Option: 2

9.24


Option: 3

16.48


Option: 4

11


Answers (1)

best_answer

[\text { Conjugate base }]=0.10 \mathrm{M}\ \mathrm{NH}_{3} \text { in } \mathrm{H}_{2} \mathrm{O}

\begin{array}{l}{\text {[Conjugate acid] }=1.0 \mathrm{M} \mathrm{N} \mathrm{NH}_{4}^{+}} \\\\ {\mathrm{pOH}=\mathrm{pK}_{\mathrm{b}}+\log \frac{[\mathrm{Salt}]}{[\mathrm{Base}]}} \\\\ {=4.76+\log \frac{1.0}{0.1}} \\\\ {=4.76+\log 10=5.76} \\\\ {\mathrm{pH}=14-\mathrm{pOH}} \\\\ {=14-5.76=8.24}\end{array}

Therefore, option(1)is correct

Posted by

Rakesh

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