# What is the number of moles of hydroxide ions in a 5*g mass of magnesium hydroxide?

Approx. $0.2 \cdot m o l$.
$= 2 \times \frac{5 \cdot g}{58.32 \cdot g \cdot m o {l}^{-} 1} = 0.188 \cdot m o l$ WITH RESPECT TO HYDROXIDE IONS. What would be the $p H$ of a solution of this material if we made up the volume to $1.00 \cdot L$?