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At 298 K the Ksp for magnesium carbonate is 4.0e-5 and that for barium carbonate is...

At 298 K the Ksp for magnesium carbonate is 4.0e-5 and that for barium carbonate is 8.1e-9. Assuming that both magnesium ion and barium ion have 1.0e-3 M concentrations, what is the equilibrium concentration of carbonate ion that will precipitate the maximum concentration of barium ion without precipitating any magnesium ion?

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