Mg(OH)2, commonly known as magnesium hydroxide, is classified as a base. This compound consists of magnesium ions (Mg2+) and hydroxide ions (OH–), and it exhibits alkaline properties when dissolved in water.
Magnesium hydroxide reacts with acids to form salt and water, which is a characteristic behavior of bases. When it comes into contact with acids, it can neutralize them, resulting in a pH increase in the solution. This property makes it useful in various applications, such as in antacids for relieving heartburn and indigestion.
In summary, magnesium hydroxide is indeed a base due to its hydroxide ions that can accept protons (H+ ions), confirming its classification in the context of acid-base chemistry.