Approximately one out of every 555 million water molecules autoionize.

Name: Approximately one out of every 555 million water molecules autoionize.
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Autoionization is a rare event where a water molecule, in the presence of other water molecules, can donate a proton to another water molecule to form a hydronium ion (H3O+) and a hydroxide ion (OH-). This process has a very low probability, with approximately one out of every 555 million water molecules undergoing autoionization at any given time.

Approximately One Out of Every 555 Million Water Molecules Autoionize