pHDefinition (http://en.wikipedia.org/wiki/PH
http://goldbook.iupac.org/P04524.html) In chemistry, pH is a measure of the activity of the (solvated) hydrogen ion. p[H], which measures the hydrogen ion concentration is closely related to, and is often written as, pH. Pure water has a pH very close to 7 at 25°C. Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline. (Wikipedia) Preferred Units: N/A Scope Note: N/A This term is used for the following terms: Hydrogen ion concentration
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