Question

pH of acid rain is sometimes as low as 2. Explain.

Answer 1

Normal rain is only slightly acidic having a pH of about 5.6.

This is because carbon dioxide reacts with it to form weak carbonic acid.

CO₂ + H₂O → H₂CO₃

pH of acid rain usually ranges between 5.6 and 3.5; at times, it can be as low as 2.