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Rain Water Acidity
By Juniper Russo
Rain water is naturally slightly acidic, with a pH of about
5.0.
Natural variations and human pollutants may cause rain to
be more acidic. Depending on region, season and presence of pollutants, the pH
of rain may drop to as low as 2.0 (the acidity of vinegar).
Carbonic Acid
The acidity of "normal" rain is attributed to
carbonic acid, a natural compound that forms during the water cycle.
Natural Variations
Even in areas that are minimally affected by human
pollution, the pH of rain can range from 4.5-5.0.
Volcanic areas, including Hawaii, may experience more
acidic rain because of the sulfur-based compounds that are released into the
atmosphere by volcanic activity.
Sulfur Pollutants
In non-volcanic areas, acid precipitation is generally
caused by human pollution. Coal power plants release compounds that form
sulfuric acid, causing rain to become as acidic as lemon juice in some areas.
Effects
Acid rain is associated with river die-off, erosion, loss
of vegetation and human health problems.
Solutions
While there is no way to establish the exact natural pH of
water in any given area, ecologists agree that the threat of acid precipitation
can be mitigated through decreased industri al dependence on
fossil fuels.
Juniper
Russo, an eclectic autodidact, has
been writing professionally since 2008. Her work has appeared in several online
and print-based publications, including Animal Wellness. Russo regularly
publishes health-related content and advocates an evidence-based, naturopathic
approach to health care.
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