Answer:
Acid rain is a stronger acid.
General Formulas and Concepts:
Acids/Bases
Step-by-step explanation:
We are given that acid rain has a pH = 4.
We know that the lower the pH number, the more acidic it becomes. The higher the pH number, the more basic is becomes.
Therefore, the lower the pH scale number, the stronger the acid. Typically, the pH scale generally ranges from pH 1 to pH 14.
Comparing pH of 4 in the scale from 1 - 14, it would be a strong acid.
Topic: AP Chemistry
Unit: Acids/Bases