The increased acidity of rain, lakes and natural waterways has been a major focus of concern for the United States, Canada and several European nations in recent years.
Acid rain is produced when pollutant gases are dissolved and reacted in water.
An obvious source of gases is combustion of fossil fuels. The increased acidity of rain and waterways has damaged forests, destroyed the ability of lakes to produce a healthy environment for aquatic life, and drastically increased the erosion and weathering of buildings and monuments. You will perform experiments to show that these gases form acidic solutions, and you will titrate these solutions to determine their acid content. Your instructor will explain how indicators are used and how an indicator is selected for a titration. This is different than the degree to which an acid will dissociate.