In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added bef — JEE Mains Chemistry Past Papers Chemistry Question
Question
In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to : (A) prevent interference by phosphate ions (B) decrease concentration of –OH ions (C) increase concentration of Cl– ions (D) increase concentration of NH4 + ions
Answer: B
💡 Solution & Explanation
4 NH OH NH OH 4 NH Cl NH Cl Due to common ion effect of NH, [OH–] decreases in such extent that only group-III cation can be precipitated , due to their very low Ksp in the range of 10–38.
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