A water sample is believed to have Ca^2+ and Mg^2+ ions. A student is selected to try precipitate both ions selectively by adding 0.0400 M NaH solution. (Ksp for Mg(OH)2 = 2.06x10^-13 and Ksp for Ca(OH)2 is 4.68 x10^-6 What must be the minimum concentrations of the cations (Ca^2+ and Mg^2+) that the water sample should contain to be precipitated?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
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A water sample is believed to have Ca^2+ and Mg^2+ ions. A student is selected to try precipitate both ions selectively by adding 0.0400 M NaH solution. (Ksp for Mg(OH)2 = 2.06x10^-13 and Ksp for Ca(OH)2 is 4.68 x10^-6 What must be the minimum concentrations of the cations (Ca^2+ and Mg^2+) that the water sample should contain to be precipitated?
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