Consider the following qualitative analysis scenario and then classify what type

Question

Consider the following qualitative analysis scenario and then classify what type of qualitative analysis principle is being used. Both Ca^2+ and Ba^2+ can be precipitated by fluoride. However, they can be quantitatively separated because CaF(s) has a K_sp = 3.2 times 10^-11 while BaF(s) has a K_sp = 1.5 times 10^-6. Amphoteric Precipitate Solubilization Selective oxidation/reduction Selective precipitation Competitive equilibrium solubilization: cation complexation Fractional precipitation Competitive equilibrium solubilization: anion protonation

Explanation / Answer

Can be separated by Fractional precipitation as there is differnecce between solubility products of CaF and BaF.Fractional precipitation is a technique that separates ions from solution based on their different solubilities.When Ca+2 and Ba+2 ions are present in soution and F- ions are added resulting in CaF(Ksp=3.2*10-11) and BaF(Ksp=1.5*10-6).As Ksp for CaF is smaller than BaF ,it precipitates first

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