I already answered to your another same question but I submit here of a copy of this. Here is a link click here to learn more. Rain water is generally contains acidity but when acidity percent much then general then called it acid rain.
Acidity of acid rain may be as acidity as lemon! It harms our skin and hair. It also harmful for trees and animals.It also harmful for our building and building color.
A great example of harm of acidity is Taj mahal. When it was build it looks white as milk but now its color becomes off-white day by day...Cause of acid rain. Causes of acid rain are: Liquids with a pH less than 7 are acidic, and those with a pH greater than 7 are bases.
Clean or unpolluted rain has a slightly acidic pH of about 5.2, because carbon dioxide and water in the air react together to form carbonic acid, a weak acid (pH 5.6 in distilled water), but unpolluted rain also contains other chemicals.1 H2O (l) + CO2 (g) → H2CO3 (aq) Carbonic acid then can ionize in water forming low concentrations of hydronium and carbonate ions: 2 H2O (l) + H2CO3 (aq) is in equilibrium with CO32− (aq) + 2 H3O+ (aq) here is details about effect and cause of acid rain.
The EPA has a great website that breaks effects down by category: epa.gov/acidrain/effects.
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