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When is rain considered acid rain?

Answer and explanation

Correct answer: When pH is less than 5.6

The governing concept is the pH scale and the natural acidity of rainwater. Carbon dioxide dissolves in rain and gives ordinary clean rain a slightly acidic pH of about 5.6. When atmospheric pollutants such as sulfur dioxide and nitrogen oxides form stronger acids and lower the rainwater pH below about 5.6, the precipitation is classified as acid rain. A pH of 7 is neutral, while 10 and 14 indicate alkaline solutions.

Related tags

Acids Bases SaltsAcid RainPh ScaleAir PollutionEnvironmental ChemistryAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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