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Seawater contains 0.0056M Mg2+ and 0.010M Ca2+ 1- At what concentration of OH- would each of...

Seawater contains 0.0056M Mg2+ and 0.010M Ca2+

1- At what concentration of OH- would each of the ions above precipitate? (Ksp of Mg(OH)2 is 8.9x10^-12, Ksp of Ca(OH)2 is 5.5x10^-6 near 25C)

2- If OH- is slowly added to seawater, which of the two metal ions will precipitate first as the hydroxide?

3- Why would it be impractical to calculate the Ksp of Mg(OH)2 by the method we are using to find the Ksp of Ca(OH)2?

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