Milk of Magnesia is used when people suffer from indigestion of food. It is a

Milk of Magnesia, chemically known as magnesium hydroxide [Mg(OH)2], is used as a remedy for indigestion [1]. Indigestion occurs when the stomach produces excessive hydrochloric acid, leading to pain and irritation [1]. To alleviate this, antacids are used to neutralize the excess acid [1]. Magnesium hydroxide is specifically classified as a mild base [1]. While it is an inorganic compound that generates hydroxide ions, it is only sparingly soluble in water, which limits the concentration of these ions in solution [3]. This low solubility and partial ionization in aqueous environments result in its classification as a weak or mild base rather than a strong one [3]. Its pH is approximately 10, confirming its basic nature. Because it is mild, it can safely neutralize stomach acid without causing harm to the digestive tract [1].

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > pH in our digestive system > p. 27
2. [3] https://www.sciencedirect.com/topics/neuroscience/magnesium-hydroxide