Look up Ksp for Mg(OH)2.
.........Mg(OH)2 --> Mg^2+ + 2OH^-
I........solid.......0........0
C........solid.......x........2x
E........solid.......x........2x
Substitute the E line into the Ksp expression for Mg(OH)2 and solve for x = solubility in mols/L. Convert to g. g = mols x molar mass. This gives you solubility Mg(OH)2 in grams/L. Divide by 10 to convert to 100 mL.
Calculate the solubility (in grams per 1.00×10^2 mL of solution) of magnesium hydroxide in pure water.
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