What is the pH of normal rain water? What happens to the pH of rain water if it is accompanied by a thunderstorm and why?

Explanation

**Step-by-Step Solution:**

1. **Determine the pH of Normal Rainwater:**
- Normal rainwater has a pH of approximately 5.6. This is slightly acidic due to the presence of dissolved carbon dioxide, which forms carbonic acid (H2CO3) when it reacts with water.

2. **Consider the Effects of a Thunderstorm:**
- During a thunderstorm, conditions change significantly. The high energy from lightning can cause nitrogen (N2) and oxygen (O2) in the atmosphere to react. This reaction forms nitrogen oxides, primarily nitrogen dioxide (NO2).

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