product of concentration of H+ ions with the concentration of OH- ions must be 10^-14

[PainterGuy]

hello everyone,

i read it somewhere:--

In such a solution at 25C, the product of concentration of H+ ions with the concentration of OH- ions must be 10^-14. In an acid solution, by forcing a high concentration of H+ ions, you necessarily suppress the concentration of OH- ions.

what is this saying? how do one get 10^-14?

i am grateful for any help you can give me. many thanks.

cheers

[Borek]

what is this saying? how do one get 10^-14?

10-14 is a value of an equilibrium constant of the water autodissociation:

H2O <-> H+ + OH-

and its value is determined experimentally.

See also water ion product (http://www.chembuddy.com/?left=pH-calculation&right=water-ion-product).