In which of the following combination, is buffer action expected … - Vidyadip

MCQ

In which of the following combination, is buffer action expected ?
$(a)\, NH_4OH + NH_4Cl$
$(b)\, HCl + NaCl$
$(c)\, NH_4OH + HCl$ in $2 : 1$ mole ratio
Select the correct answer using the code given below

A
$a$ and $b$
✓
$a$ and $c$
C
$a, b$ and $c$
D
None of these

✓

Answer

Correct option: B.

$a$ and $c$

b
Combination of weak base $\left(\mathrm{NH}_{4} \mathrm{OH}\right)$ and its
salt with strong acid $\left(\mathrm{NH}_{4} \mathrm{Cl}\right)$ act as basic buffer
solution

$\mathop {N{H_4}OH}\limits_{(weak\,base)} $ $+$ $\mathop {HCl}\limits_{\left( \begin{subarray}{l}
Strong \\
acid
\end{subarray} \right)} $ $ \rightleftharpoons $ $N{H_4}Cl + {H_2}O$

initial $2$ mole $1$ mole $0$ $0$

After $(2-1)$ $(1-1)$ $0$ $0$

reaction $=1$ mole $=0$

$1$ mole $\mathrm{NH}_{4} \mathrm{OH} \,\& \,1$ mole $\mathrm{NH}_{4} \mathrm{Cl}$ are present in mixture after reaction. Hence it will also act as basic buffer

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