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Consider a solution that is 0.010 M in Ba2+ and 0.020 M in Ca2+. If sodium sulfate is added to this solution to selectively precipitate one of the cations, which will precipitate first? What is the minimum concentration of Na2SO4 that would trigger the precipitation of this cation?

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Ksp for BaSO4 = 1.07 x10–10 

Ksp for CaSO4 = 7.10 x10–5

Since the solution stoichiometry for both these compounds are similar, it would be appropriate to relate Ksp and molar solubility. Since the lower Ksp value would require the lower sulfate ion concentration in order to precipitate, it would then follow that Ba2+ would precipitate first.

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