Changes

''For technical reasons this article is titled "PH" The title should be "pH."''

''For technical reasons this article is titled "PH" The title should be "pH."''

pH ("potential of Hydrogen") measures the acidity or basicity of a (chemical) solution.  

 

'''pH''' ('''potential of Hydrogen''') measures the acidity or basicity of a (chemical) solution.  

Solutions having a pH that is less than 7 are called "acidic".  Solutions having a pH greater than 7 are called "basic".

Solutions having a pH that is less than 7 are called "acidic".  Solutions having a pH greater than 7 are called "basic".

pH equal to 7 is considered to be neutral.  This is the pH of pure water at a temperature of 25 °C.

pH equal to 7 is considered to be neutral.  This is the pH of pure water at a temperature of 25 °C.

pH is a logarithmic scale. Roughly, it can be considered to be based on the concentration of protons(H+) in the solution.<ref>Actually, it is based on something called the hydrogen ion ''activity.'' Activity is approximately the same as concentration for dilute solutions in nearly pure water.</ref>  Thus, a change of  pH by 1 corresponds to a change in concentration by a factor of 10.  In general, the pH of most substances varies from 0 to 14 although for some extreme cases the pH can be greater than 14 or less than 0.

pH is a logarithmic scale. Roughly, it can be considered to be based on the concentration of protons(H+) in the solution.<ref>Actually, it is based on something called the hydrogen ion ''[[activity]].'' Activity is approximately the same as concentration for dilute solutions in nearly pure water.</ref>  Thus, a change of  pH by 1 corresponds to a change in concentration by a factor of 10.  In general, the pH of most substances varies from 0 to 14 although for some extreme cases the pH can be greater than 14 or less than 0.

==Notes and references==

==Notes and references==