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Chemistry LibreTexts

Acid Rain

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Most of the Earth is covered in water. As such, most chemical reactions take place in aqueous solutions. Many of these reactions impact our environment and the lifeforms that inhabit our planet. Some of these reactions are due to the human impact on the planet. Efforts are being made to minimize the negative effects human activity has had on the planet.

Acid Rain

Any precipitation (rain or snow) that has a pH lower than 5.7 is considered acid rain. It is caused by emissions of sulfur dioxide and nitrogen oxides; these emissions react with the water in our atmosphere to produce acids. Sulfur dioxide can be produced by volcanic eruptions and nitrogen dioxides by lightning strikes. Most of the harmful chemical are released by human activities. These chemicals travel up into the atmosphere, mix with rain clouds, and fall in the form of acid rain. The acid rain can cause corrosion of steel structures such as bridges, stone statues, and the peeling of paint. Much of these chemicals originate from electricity generation, factories, and motor vehicles.

  • Sulfur dioxide is oxided by reaction with the hydroxyl radical according to the following reactions:

SO2+OHHOSO2

HOSO2+O2HO2+SO3

  • In the presence of water, sulfur trioxide becomes sulfuric acid:

SO3+H2OH2SO4sulfuric acid

NO2+OHHNO3nitric acid

  • In a cloud, sulfur dioxide can by hydrolyzed:

SO2(g)+H2OSO2H2O

SO2H2OH++HSO3

HSO3H++SO23

From ChemPRIME:11.8: Strong Acids and Bases

Contributors and Attributions


This page titled Acid Rain is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Ed Vitz, John W. Moore, Justin Shorb, Xavier Prat-Resina, Tim Wendorff, & Adam Hahn.

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