In the precipitation of the iron group in qua | vedclass

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Question

(A) $NH_4Cl$ is a strong electrolyte that dissociates completely to provide $NH_4^+$ ions. According to the common ion effect,the presence of excess $

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Decrease concentration of $OH^{-}$ ions

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(A) $NH_4Cl$ is a strong electrolyte that dissociates completely to provide $NH_4^+$ ions. According to the common ion effect,the presence of excess $NH_4^+$ ions suppresses the ionization of the weak base $NH_4OH$ $(NH_4OH \rightleftharpoons NH_4^+ + OH^-)$. This decreases the concentration of $OH^-$ ions in the solution. This controlled concentration of $OH^-$ ions is sufficient to exceed the solubility product $(K_{sp})$ of $III$ group hydroxides (like $Fe(OH)_3$,$Al(OH)_3$,$Cr(OH)_3$) but not enough to precipitate hydroxides of $IV$,$V$,and $VI$ group radicals. Therefore,the correct option is $(A)$.

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

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