What factors influence the pH of water?
1. Rainwater provides a significant amount of water to a watershed. Acid rain is caused by increased amount of nitrogen oxides and sulfur dioxides automobile and coal-fired power plant emissions. Nitrogen oxides and sulfur dioxides are changed to nitric acid and sulfuric acid when they interact with water in the atmosphere. These acids combine with moisture in the air and fall to the earth as acid rain or snow. Consequently, the pH of rain influences the overall pH of the watershed. 2. The kind of rocks or soil around a watershed over which runoff passes can also affect the overall pH. If limestone is present, the alkaline rocks may neutralize the acidic water. 3. Algal blooms may cause the water s pH to become more basic. 4. As aquatic plants decompose, they release carbonic acid into the water. What is the optimal pH for most aquatic plants and animals? 1. Most living organisms require a pH that is near neutral (pH=7). Pure deionized water has a pH that is neutral because it has an e
