pH of acid rain is sometimes as low as 2. Explain.
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Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, whenrain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic.
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Liquids with a pH less than 7 are acid, and those with a pH greater than 7 are alkaline (or basic). "Clean" or unpolluted rain has a slightly acidic pH of 5.6, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid
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