are some things that can change the concentration of hydrogen ions
(pH) in water?
Rain water normally has a pH of approximately 5.6.
However, airborne pollutants generated from industrial plants and
automobiles burning fossil fuels create nitrous oxides and sulfur
dioxides. These airborne ions can combine with water vapor
to form nitric acid and sulfuric acid. In the presence of
such pollution, rain water will become more acidic; as low as pH
= 4.0. This acid rain, therefore, has more than 10 fold greater
concentrations of hydrogen ions than normal rain water. When
this acid rain runs into lakes, river, or streams, the pH of these
bodies of water can be changed to levels that are not compatible
with aquatic life.
learn more about acid rain.
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