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  • In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide toOption: 1 Decrease conc

In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to

Option: 1

Decrease concentration of \mathrm{OH}^{-}ions


Option: 2

Prevent interference by phosphate ions


Option: 3

Increase concentration of \mathrm{Cl}^{-}ions


Option: 4

Increase concentration of \mathrm{NH}_{4}^{+}ions


Answers (1)

best_answer

As \mathrm{NH}_{4}\mathrm{Cl} is a strong electrolyte, it supresses the ionization of \mathrm{NH}_{4} \mathrm{OH}. due to common effect as shown below :

\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}

This leads to a decrease in the concentration of ions in the solution. This is sufficient to precipitate the III group basic radicals because the solubility product of III group hydroxides is lower than IV, V and Vl group hydroxides. 

Hence, the correct answer is Option (1)

Posted by

SANGALDEEP SINGH

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