Introduction – what is pH?

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