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Which of the following pairs of cations can be separated by adding NH4Cl, NH4OH and then (NH4)2CO3 t — Qualitative and Quantitative Analysis Chemistry Question

Question

Which of the following pairs of cations can be separated by adding NH4Cl, NH4OH and then (NH4)2CO3 to the mixture?

Answer: A

💡 Solution & Explanation

Ca2+ precipitates as CaCO3 (Group V), while Mg2+ remains in solution because NH4Cl suppresses the CO3^2- concentration below the level needed to precipitate MgCO3.

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