When NH4Cl is not used together with NH4OH in group-III reagent which of the following cation will n — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

In the absence of NH4Cl, the dissociation of NH4OH is large, so OH- concentration is high enough to precipitate Fe2+, Cr3+, and Zn2+ due to their lower Ksp. However, Ba(OH)2 has a very high Ksp and is soluble, so Ba2+ will not precipitate.