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Why Does Rain Water Have Ph Less than 7? - Chemistry

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One Line Answer

Why does rainwater have pH of less than 7?

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Solution

Carbon dioxide reacts with water to form weak carbonic acid which is slightly acidic having a pH of about 5.6.

Hence, the pH of rainwater usually ranges between 5.6 and 3.5; at times, it can be as low as 2.

Concept: Causes of Acid Rain
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APPEARS IN

Selina Concise Science Chemistry 1 Class 9 ICSE
Chapter 8 Atmospheric Pollution
Exercise 8 (B) | Q 1 | Page 133
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