In the systematic precipitation of Group III basic radicals (), the prior addition of solid before is theoretically mandatory in order to:

Question

In the systematic precipitation of Group III basic radicals ($Fe^{3+}, Al^{3+}, Cr^{3+}$), the prior addition of solid $NH_4Cl$ before $NH_4OH$ is theoretically mandatory in order to:

Prashant Kotian · Accepted Answer

Correct answer: B. provides a high concentration of ions, shifting the ionization equilibrium of backwards (common ion effect). The resulting low is sufficient to precipitate the very low Group III hydroxides but insufficient to precipitate Group IV-VI hydroxides.

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