Question

Aqueous sodium hydroxide is added to an aqueous solution that contains 0.0099 M magnesium chloride and 0.021 M calcium chloride.

What will be the concentration of the metal ion that precipitates first (as M(OH)2) at the time the second metal ion begins to precipitate?

Ksp (Mg(OH)2) = 6.3 x 10^-10 and Ksp (Ca(OH)2) = 6.5 x 10^-6

Hint: Use Ksp values to determine the solubility of each product to determine the order of precipitation.

Answer 1