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Why does the rain water normally have a ...

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

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Normally rain has a pH of about 5.6 due to dissolution of `CO_2` of the atmoshpere into it `(CO_2 + H_2O to H_2CO_3 hArr 2H^(+) +CO_3^(2-))` When the pH of rain falls below about 5.6 , it becomes acid rain.
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Why does rain water have normally pH of about 5.6?

Why does rain water have a pH of about 5-6 ?

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 ?

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