# 9.18 What do you understand by the term auto-protolysis of water? What is its significance?

It means water molecules can react with each other and form hydronium ion and hydroxide ion. (self-ionization)

$H_{2}O(l)+H_{2}O(l)\rightarrow H_{3}O^{+}(aq)+OH^{-}(aq)$

it indicates its amphoteric nature; means behave as acid as well as the base.

the Hydronium Ion - conjugate acid

the hydroxide ion - conjugate base

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