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 when magnesium oxide reacts with water, resulting in a slightly alkaline solution. In addition to its use in medicine, Mg(OH)₂ is utilized in various industrial applications, such as wastewater treatment and as a flame retardant. Its ability to neutralize acids makes it valuable in chemical processes, while its low solubility in water helps control pH levels in different environments.