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If rainfall occurs together with a thunderstorm, what happens to the pH of the collected rainwater?

1. It becomes slightly higher than the pH of rainwater falling without a thunderstorm
2. It remains unaffected by the presence of a thunderstorm
3. It varies according to how much dust is present in the air
4. It becomes slightly lower than the pH of rainwater falling without a thunderstorm

Correct answer: It becomes slightly lower than the pH of rainwater falling without a thunderstorm

Solution

During a thunderstorm, lightning can produce nitrogen oxides, which dissolve in rainwater and form nitric acid, leading to a decrease in pH. This results in the rainwater being more acidic compared to rain that falls without a thunderstorm.

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