Changes

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

'''pH''' (potential of Hydrogen) is a measure of the [[acid]]ity or [[base|basicity]] of a [[chemical]] solution.

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

pH is defined as the negative log of the [[concentration]] of [[hydrogen]] ions in a solution. (Technically, it is not based on concentration, but ''[[activity]]'', however the activity is very close to the concentration for water solutions).  

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. Since pH is logarithmic, a change of  pH by 1 corresponds to a change in concentration by a factor of 10.

 

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.

 

[[Category:Chemistry]]

[[Category:Chemistry]]