This is a measurement of the hydrogen ion concentration of a solution.
Sorenson found that the strength (potenz) of a hydrogen ion solution is a logarithmic function.
pH = -log (H+)
At equilibrium, at 25 degrees centigrade, the ionic product of water is 10-14 Molar.
H20 = H+ +OH- = 10-14
Therefore the concentration of hyrogen ions at equilibrium is 10-7M.
Using the Sorenson equation, the value of pH at equilibrium is 7.
So pH7 is neutral.
Greater than pH7 is alkali and less than pH7 is acidic.
Posted in: E-chem