pH measures the concentration of hydrogen ion
(H+) or acidity in a liquid. The pH values of most aqueous solutions, such
as drinking waters, have pH values of around 6 to 8. The more acidic the
water the lower the pH. Conversely, the more alkaline the solution the
higher the pH. The pH scale is logarithmic, which means that each 1 unit
variation in pH represents a 10 fold change in the hydrogen ion
concentration. For example, water with a pH of 4.0 is 100 times more
acidic than one of pH 6.0. |
