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  4. What is the reaction given below, called? H2O(l) +H2O(l) leftharpoons H3O+(aq) +OH-(aq)

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Q. What is the reaction given below, called?
$H_2O_{(l)} +H_2O_{(l)} \rightleftharpoons H_3O+_{(aq)} +OH^{-}_{(aq)}$

Hydrogen

Solution:

The reaction in which two molecules of the same species react to give ions by proton transfer is known as auto-protolysis or self ionisation. In this reaction, proton from one $H_2O$ molecule is transferred to another $H_2O$ molecule.
$H_2O_{(l)} +H_2O_{(l)} \rightleftharpoons H_3O+_{(aq)} +OH^{-}_{(aq)}$