Ionic Compound: An ionic compound is composed of positively charged ions (cations) and negatively charged ions (anions), held together by electrostatic forces.
Precipitation Reaction: A precipitation reaction occurs when two aqueous solutions react to form an insoluble solid (precipitate), in this case, Mg(OH)2.
Solubility: Solubility refers to the ability of a substance to dissolve in a solvent, such as water. In the case of Mg(OH)2, it has limited solubility.