Ionic Product of Water

$$K_w = [H^+] \cdot [OH^-] = 10^{-14} \text{ (at 298 K)}$$

Concept: Represents the equilibrium constant for the self-ionization of water at a given temperature.

Notation:

• $$[H^+]$$ = Molar concentration of hydrogen ions;
• $$[OH^-]$$ = Molar concentration of hydroxyl ions;
• $$K_w$$ = Ionic product of water