Calculate the molar solubility in water.
Mg(OH)2 is a sparingly soluble compound, in this case a base, with a solubility product, Ksp, of 5.61 x 10^-11. It is used to control the pH and provide nutrients in the biological (microbial) treatment of municipal wastewater streams.
Based on the given value of the Ksp, what is the molar solubility of Mg(OH)2 in pure H2O?
Express your answer with the appropriate units.