In the group III radicals,in place of NH_4Cl, | vedclass

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(A) The group $III$ radicals $(Fe^{3+}, Al^{3+}, Cr^{3+})$ are precipitated as hydroxides using $NH_4OH$ in the presence of $NH_4Cl$. $NH_4Cl$ provide

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$NH_4NO_3$

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(A) The group $III$ radicals $(Fe^{3+}, Al^{3+}, Cr^{3+})$ are precipitated as hydroxides using $NH_4OH$ in the presence of $NH_4Cl$. $NH_4Cl$ provides $NH_4^+$ ions,which suppress the ionization of $NH_4OH$ due to the common ion effect,ensuring that the concentration of $OH^-$ ions is low enough to prevent the precipitation of group $IV$ and $V$ radicals. Any ammonium salt that provides $NH_4^+$ ions without introducing interfering anions can be used. $NH_4NO_3$ is a suitable substitute because it provides $NH_4^+$ ions and does not interfere with the precipitation process. $(NH_4)_2SO_4$ cannot be used because $SO_4^{2-}$ ions would precipitate $Ba^{2+}, Sr^{2+},$ and $Ca^{2+}$ as sulfates.

In the group $III$ radicals,in place of $NH_4Cl$,which of the following can be used?

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