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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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The rain water is acidic and has pH nearly 5.6. This is due to dissolution of `CO_(2)` in water vapours present to form `H_(2)CO_(3)` which is of acidic nature. When pH further decreases to about 3 to 4.5 due to dissolution of oxides of nitrogen and sulphur in water, the rain water represents acid rain.
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Why does rain water have a pH of about 5-6 ?

Why does the rain water normally have a pH of about 5.6 ? When does it become acid rain?

Why does the rain water normally have a pH of about 5.6 ? When does it become acid rain ?

Carbon dioxide is an essential component of atmosphere. However, when the concentration of CO_2 increases in the atmosphere, it can lead to global warming through green house effect. Similarly, rain water is an essential source of water. It has pH of 5.6 due to the formation of H^+ ions from the reaction of rain water with CO_2 present in the atmosphere. When pH of the rain water falls below 5.6 due to the presence of acids in the atmosphere, it has very damaging effects. Why does the rain water normally have a pH of about 5.6 ?

Assertion : Normal rain water has a pH of about 5.6. Reason : The pH is due to dissolution of CO_2 to form carbonic acid.

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