Why does rain water have normally pH of about 5.6?

Explanation

**Step-by-Step Solution:**

1. **Understanding pH Scale**:
- The pH scale ranges from 0 to 14. A pH of 7 is neutral, below 7 indicates acidity, and above 7 indicates basicity.
- Rainwater typically has a pH of about 5.6, which means it is slightly acidic.

2. **Formation of Carbonic Acid**:
- Rainwater becomes acidic primarily due to the presence of carbon dioxide (CO₂) in the atmosphere.
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