why does rain water have pH less than 7
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The lower a substance's pH (less than 7), the more acidic it is; the higher a substance's pH (greater than 7), the more alkaline it is. Normal rain has a pH of about 5.6; it is slightly acidic because carbon dioxide (CO2) dissolves into it forming weak carbonic acid.
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Explanation:
When rain falls from the sky, the CO2 present in the atmosphere gets dissolved in it forming mild carbonic acid which makes the rainwater acidic. and hence its pH < 7.
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