According to the Pennsylvania Department of Conservation and Natural Resources (DCNR), changes in water's pH levels are caused by the dumping of certain chemicals into water systems. Dumping may be done by communities, i... More »

Living organisms depend on a proper balance of hydrogen and hydroxide ions in order to maintain essential physiological processes. Scientists use pH to express the concentration of hydrogen ions in a solution. Many organ... More »

Changing the pH level can change the shape of a protein. This process is called "denaturing" the protein. When a protein becomes denatured, it does not function optimally or it does not function at all. More »

Depending on the chemicals in the soil, the pH of water passing through it increases, decreases or remain the same. In areas where water passes through soil containing limestone, dissolving the calcium carbonate in water... More »

Pure distilled water has a pH of 7. The pH scale ranges from 0 to 14, with pH levels less than 7 considered acids and pH levels over 7 considered bases. A pH level of 7 is neutral. More »

Some pH levels of common substances include a pH of 7.0 for pure water, a pH of 2.0 for lemon juice and a pH of 11.0 for ammonia. Human blood has a pH of 7.4, tomatoes have a pH of 6.6, and vinegar has a pH of 2.2. More »

Red cabbage juice is a good indicator of pH because it contains flavin, a pigment molecule that changes colors according to the concentration of hydrogen ions in a solution. The juice is prepared by soaking chopped red c... More »