Mg(OH)2, or magnesium hydroxide, is a white, odorless powder that is commonly used as an antacid to relieve heartburn and indigestion. It is also known as milk of magnesia when suspended in water. This compound is formed by the reaction of magnesium oxide with water or by neutralizing magnesium salts with a strong base. In addition to its use in medicine, Mg(OH)2 has applications in various industries. It is used as a flame retardant, a filler in plastics, and a neutralizing agent in wastewater treatment. Its ability to absorb excess acidity makes it valuable in both environmental and industrial processes.