Question

The natural source of acidity in rain water is _____.

Answer 1

Answer:

carbonic acid

Explanation:

Carbonic acid refers to the natural existent acid in our atmosphere which is produced when water reacts with water vapor and it makes rain naturally acid. As a result, rainwater is always acidic. On the other hand, acid rain occurs when precipitation contains a higher than normal acidity  and a pH lower than 5.0.

Answer 2

Answer:

Carbonic acid

Explanation:

Hello,

In this case, due to the increasing concentration of carbon dioxide in the atmosphere, when it rains, the following chemical reaction occurs between water and carbon dioxide:

$CO_2+H_2O\rightarrow H_2CO_3$

Whose product is known as carbonic acid and it is the natural source of acidity in acid rain.

Regards.