A 350 mL saturated solution of magnesium hydroxide, Mg(OH)2 is prepared at 25 degrees Celsius. The solubility product constant, Ksp, for Mg(OH)2 is 1.8 x 10^-11 at 25 degrees Celsius.
1) Find the molar solubility of Mg(OH)2 at 25 degrees Celsius?

2) What is the concentration (mol/L) of hydroxide ion, OH-, in the saturated solution at 25 degrees Celsius?

For 1: The solubility of magnesium hydroxide at 25°C is

For 2: The concentration of hydroxide ion in the saturated solution at 25°C is

Explanation:

The equation for the ionization of the magnesium hydroxide is given as:

                                    s            2s

Expression for the solubility product of will be:

We are given:

Putting values in above equation, we get:

Hence, the solubility of magnesium hydroxide at 25°C is

Concentration of hydroxide ion in the solution = 2s =

Hence, the concentration of hydroxide ion in the saturated solution at 25°C is

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