(a) Due to release of excess of hydrochloric acid, we suffer from acidity. An antacid tablet consists of a base like Milk of Magnesia (magnesium hydroxide). It neutralizes the effect of excessive acid and brings relief.
(b) The sting of an ant contains formic acid which causes irritation on the skin. Calamine solution contains, zinc carbonate which is a base. Calamine solution neutralizes the acid effect of the ant bite when applied on the skin.
(c) The wastes of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill aquatic organisms. The factory wastes are, therefore, neutralized by adding basic substances.
