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Why does rain water have normally pH of ...

Why does rain water have normally pH of about 5.6?

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Normally rain has a pH of about 5-6 due to dissolution of `CO_(2)` of the atmosphere into it.
`CO_(2) +H_(2)O to H_(2)CO_(3) hArr 2H^(+) + CO_(3)^(2-)`
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Assertion : Normally rain water has a pH of 5.6 Reason : H^(+) ions are formed by the reaction of rain water with carbon dioxide present in the air.

The pH of rain water, is approximately : a) 5.6 b) 7.5 c) 7.0 d) 6.5

Assertion (A) : The pH of acid rain is less than 5.6. Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.