Milk of magnesia:

Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite.

Suspensions of magnesium hydroxide in water (milk of magnesia) are used as an antacid to neutralize stomach acid, and a laxative. 
Molar mass: 58.3197 g/mol
IUPAC ID: Magnesium hydroxide
Formula: Mg(OH)2
Melting point: 350 °C
Density: 2.34 g/cm³
Soluble in: Water

Properties of Milk of Magnesia

  • The chemical formula of milk of magnesia can be represented as Mg(OH)2.
  • The molar mass of this chemical compound is equal to 58.3197 grams per mole.
  • Under standard conditions, this compound exists as a white solid that does not have any characteristic odour.
  • The density of milk of magnesia, under standard conditions for temperature and pressure (STP), corresponds to 2.3446 grams per cubic centimetre.
  • The melting point of this compound can be approximated to 350 degrees Celsius. However, it is important to note that this compound begins undergoing decomposition at this temperature gradient.
  • Milk of magnesia is not very soluble in water. At a temperature of 25 degrees Celsius, the solubility of this compound in water corresponds to 0.00064 grams/100 mL. When the temperature is raised to 100 degrees Celsius, the solubility of this compound in water increases to 0.004 grams/100 mL.
  • It can be noted that magnesium hydroxide crystallizes in a hexagonal crystal lattice.