The autoionization of water, where H2O acts as both an acid and a base, is the focus of this episode. This process generates H3O+ and OH- ions. The equilibrium constant for this reaction is the Ion-Product Constant for Water, Kw, expressed as Kw = [H3O+][OH-]. At 25°C, the value of Kw is 1.0 x 10-14. This constant is essential for all aqueous solutions as it directly links the concentrations of the acidic and basic ions, allowing one concentration to be determined if the other is known.