Pure water is considered a neutral substance. For instance, a substance that has a pH of 5 is ten times more acidic than a substance with a pH of 6! This kind of scale is called a logarithmic scale. It is neither acidic nor basic.Įvery level on the pH scale is ten times greater than the one before. Substances that are closer to 14 on the pH scale are considered basic, or alkaline.They have a very low concentration of dissolved H+ ions and a very high concentration of OH- ions.Ī substance that sits at 7 on the pH scale is considered neutral. They have a very high concentration of dissolved H+ ions and a very low concentration of OH- ions. Substances that are closer to 0 on the pH scale are considered acidic. What is pH?Ī substance’s pH is the measurement of its dissolved positively charged hydrogen ions (H+) and negatively charged hydroxide ions (OH-). The pH of a substance is measured on a scale from 0 to 14.
Precipitation can include rain, snow and fog.Īlthough acid rain was first observed in England as early as the 1850s, the Canadian Government didn't officially recognize its existence until 1979. Acid rain is any precipitation that has an unusually low, or acidic, pH. People were very worried about something called acid rain. But a couple of decades ago, the headlines were different. These days, if you click on a news website, chances are you’ll see an article on climate change.
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