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The presence of \mathrm{NH}_{4} \mathrm{Cl} in the test solution while precipitating Group III hydroxides (in qualitative inorganic analysis) helps in

Option: 1

Lowering \left[\mathrm{OH}^{-}\right]


Option: 2

Lowering \left[\mathrm{NH}_{4} \mathrm{OH}\right]


Option: 3

Increasing \left[\mathrm{OH}^{-}\right]


Option: 4

Increasing \left[\mathrm{NH}_{4} \mathrm{OH}\right]


Answers (1)

best_answer

\mathrm{NH_4OH} is a weak electrolyte while \mathrm{NH_4Cl} is a strong electrolyte.

\begin{aligned} &\mathrm{NH}_{4} \mathrm{OH} \rightleftharpoons \mathrm{NH}_{4}^{+}+\mathrm{OH}^{-}\\ &\mathrm{NH}_{4} \mathrm{Cl} \rightarrow \mathrm{NH}_{4}^{+}+\mathrm{Cl}^{-} \end{aligned}

\mathrm{NH}_{4}\mathrm{Cl} decreases the dissociation of \mathrm{NH}_{4}\mathrm{OH} by common ion effect.

Hence, the correct answer is Option (1)

Posted by

Irshad Anwar

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