Home » UPSC Geoscientist » The natural rain water has a pH value of:

The natural rain water has a pH value of:

June 1, 2025 by rawan239

The natural rain water has a pH value of:

5.6

6.5

7.0

Zero

This question was previously asked in

UPSC Geoscientist – 2021

Download PDF Attempt Online

The pH of natural, unpolluted rainwater is typically around 5.6.

Rainwater is naturally slightly acidic because carbon dioxide (CO2) from the atmosphere dissolves in it, forming weak carbonic acid (H2CO3).

Acid rain, caused by pollutants like sulfur dioxide (SO2) and nitrogen oxides (NOx), has a pH lower than 5.6. Pure water has a neutral pH of 7.0, but rainwater is never pure due to dissolved atmospheric gases.

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