MgCO3 is not precipitated with the carbonates of Vth group radicals in presence of NH4Cl and NH4OH b — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

NH4Cl suppresses the ionization of (NH4)2CO3 (common ion effect), keeping the CO3^2- concentration low. This is sufficient to exceed the Ksp of Group V carbonates but not the higher Ksp of MgCO3.