Acid rain is a type of rain or any other form of precipitation that has an unusual level of acidity

Which means it has a high level of hydrogen ions (low pH). It can cause harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by the emission of sulfur dioxide and nitrogen oxide, which interact with water molecules in the atmosphere and create acids. Since the 1970s, governments have made efforts to lower the level of sulfur dioxide released into the atmosphere, achieving positive results. Nitrogen oxides can be produced naturally by lightning strikes while sulfur dioxide from volcanic eruptions. Chemicals in acid rain can cause paint to be removed, corrosion of steel structures on bridges and erosion of stone statues.
Formation of acid rain

Creating acid rain

Due to the release of acidic gases into the atmosphere and their solubility in raindrops, it then collapses into such acidic soil. In normal rain conditions there is a small amount of acidity. This rate depends on the amount of CO2 dissolved in it, as well as small amounts of chlorine. By standards the acidity should be pH = 5.0. Before the industrial revolution it was 5-6, and now it has grown. Acrylic acid is formed by the reaction:
H2O (l) + CO2 (g) H2CO3 (aq)
Subsequently carbonic acid can be ionized in water forming low concentrations of hydron and carbonate ions:
H2O (l) + H2CO3 (aq) HCO3− (aq) + H3O + (aq)
Acid deposits in the environment may also include acids other than H2CO3 acid.

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