Question

What is the term used when the rainwater has a pH less than $5.6$?

Answer 1

Acid rain

• When the pH of the rainwater drops below $5.6$, it is called acid rain.
• “Acid rain refers to the ways in which acid from the atmosphere is deposited on the earth’s surface.”

Causes of acid rain

• Acid rain harms trees, crops, and plants by dissolving and washing away nutrients required for growth.
• It causes respiratory problems in both animals and humans.
• Buildings and other structures composed of stone or metal are harmed by acid rain.

Hence, acid rain is the term used when the rainwater has a pH less than $5.6$.