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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?

Grade:12

2 Answers

Suraj Prasad IIT Patna
askIITians Faculty 286 Points
9 years ago
Pure water has a pH of 7.0 (neutral); however, natural, unpolluted rainwater actually has a pH of about 5.6 (acidic).[Recall that pH is a measure of the hydrogen ion (H+) concentration.] The acidity of rainwater comes from the natural presence of three substances (CO2, NO, and SO2) found in the troposphere (the lowest layer of the atmosphere).
Karan Dholakia
19 Points
6 years ago
) found in the troposphere (the lowest layer of the atmosphere).2NO, and SO2,Pure water has a pH of 7.0 (neutral); however, natural, unpolluted rainwater actually has a pH of about 5.6 (acidic).[Recall that pH is a measure of the hydrogen ion (H+) concentration.] The acidity of rainwater comes from the natural presence of three substances (CO

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