| pH |
|
|
PowerHead
-or-
a measure of the acidity and the base of a solution in terms of activity of hydrogen (H+) (strictly speaking, there is no such thing as the H+ ion; it is the H3O+, called the hydroxonium ion). For dilute solutions, however, it is convenient to substitute the activity of the hydrogen ions with the concentration, molarity (mol/L) of the hydrogen ions (however, this is not necessarily accurate at higher concentrations).
In aqueous systems, the hydrogen ion activity is dictated by the dissociation constant of water (Kw = 1.011 × 10−14 M2 at 25 °C) and interactions with other ions in solution. Due to this dissociation constant, a neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered basic. |
Last Updated: March 7th, 2008 @ 11:02 PM
|
All times are GMT -4. The time now is 04:28 AM.
