Provide equation for autoionization of water?

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jerichorayel eNotes educator| Certified Educator

Auto ionization of water is also called self-ionization of water where in the water molecules tend to ionize itself in an aqueous solution. In this phenomenon, one H2O molecule loses its proton (H+) and another H2O molecule accepts the proton which was earlier released. The equation for the auto ionization of water can be written as:


H2O + H2O <----> H3O+  +  OH-

It is a reversible process (indicated by the double arrow sign). In general this reaction is called autoprotolysis which is a characteristic of amphoteric substances like water.

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