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

Solution

Rain -water normally has a pH of 5.6 due to the formation of carbon dioxide present in the atmosphere.
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When the pH of the rain drops below 5.6, it becomes acidic. Actually, the acidity of rain water is increased due to the large quantity of SO₂ and oxides of nitrogen present in the air.

Some More Questions From Environmental Chemistry Chapter

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Environmental Chemistry

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

Some More Questions From Environmental Chemistry Chapter

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