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Similar term(s): acidity, alkalinity.
pH is a measure of the concentration of protons (H+) in a solution and, therefore, its acidity or alkalinity. The concept was introduced by S.P.L. Sørensen in 1909. The p stands for the German "Potenz", meaning power or concentration, and the H for the hydrogen ion (H+). In layman's terms , the "pH" value is an approximate number between 0 and 14 that indicates whether a solution is acidic (pH < 7), basic (pH > 7) or neither (pH = 7) [neutral].
Source: GreenFacts
Acids taste sour and react strongly with metals. Strong acids can burn your skin. Examples of acids include vinegar, citrus fruits and stomach acid (HCl).
Bases taste bitter and feel slippery. Strong bases can burn your skin. Examples of bases include lye (sodium hydroxide used to make soap) and ammonia.
When acids and bases are added to each other, they react to neutralize each other, forming salt and water.
Source: GreenFacts, based on: Technology Studies in Education
Acids
Bases and pH Scale
Español: pH
Français: pH
Nederlands: pH
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