The negative logarithm of the hydrogen ion concentration, in mol/liter. Measure of the acidity or
alkalinity of an aqueous solution. pH=7 represents neutrality, i.e., the solution is neither acid nor
alkaline. pH values from 0 to 7 are acidic, the lower the pH value, the higher the degree of
acidity; pH values from 7 to 14 represent alkalinity. The higher the pH value above 7, the greater
the degree of alkalinity
