1. Acid Rain
By: Pablo Pinero Pacheco and Juan
Cruz Gomez Roca.

2. The Acid Rain problem
• Carbon dioxide can dissolve in rain water to
form carbonic acid. The Carbonic Acid is a
weak acid. It partially ionises to form
hydrogen ions.

3. • The hydrogen ions from carbonic acid
give natural rain water an acid pH
value of 5.6.This acidic solution has
been responsible for the formation of
caves in areas of limestone rocks.

4. • During the last years the acid rain had become
even more acid than before. This rain has been
caused by the emission of gases such as sulfur
dioxide. When coal is burned in electricity power
stations, sulfur impurities form sulfur dioxide. The
gas is also produced when fuels obtained from
crude oil are burned. This gas gives the rain water
a lower Ph of 5.0 which can damage statues or
even buildings. Even more acid Ph can kill trees
and fishes.

5. Sources of sulfur dioxide