pH Value

The pH value is a measurement of the acidic or basic character of water or a solution. Pure water has a pH value of 7 (neutral). Acidic water has a pH value of less than 7, and a pH of over 7 is considered basic. Lemon juice has a pH of 2.4 (acid), pure water a value of 7 (neutral), and bleach a pH value above 12 (alkaline).