pH is the “potential of Hydrogen.” It is a measure of the acidity or alkalinity of a solution. The pH scale ranges from 0 to 14, with 7 being neutral. A solution with a pH less than 7 is considered acidic, while a solution with a pH greater than 7 is considered basic or alkaline.

The pH potential of hydrogen can be used to measure the acidity or alkalinity of a variety of solutions, including those found in nature and in laboratories. For example, rainwater has a naturally low pH due to the presence of carbon dioxide in the atmosphere, which forms carbonic acid when it comes into contact with water. This makes rainwater slightly acidic and gives it a sour taste.