Question

Explain the following:

(a) Calamine lotion is applied on bee stings.
(b) Antacids are taken in case of acidity in stomach.
(c) Slaked lime is added to factory waste before it is discharged into rivers.

Answer 1

(a) Calamine lotion contains a base called zinc carbonate which has a neutralizing effect on acids. A bee sting releases an acidic liquid into the skin. In order to neutralize the effect of the bee sting, calamine lotion is rubbed on the skin.

(b) In case of acidity in stomach, an antacid such as magnesium hydroxide is taken. Magnesium Hydroxide is a base which is known to be very effective in neutralizing acids. Therefore, to relieve indigestion, an antacid is taken as it helps in correcting the excess acidity in the stomach.

(c) Calcium hydroxide or slaked lime is a base which has a neutralizing effect on acids. It is added to the factory waste before being discharged into rivers because the factory waste contains many acids. The acids are very toxic and will destroy the aquatic life. In order to neutralize the acidic components in the waste, slaked lime is added to it.