Ncert Exercises & Solutions

Auto-protolysis (self-ionization) of water is a chemical reaction in which two water molecules react to produce a hydroxide ion (OH–) and a hydronium ion (

H_{3} O^{+}

The reaction involved can be represented as:

$H_{2} O_{(I)} + H_{2} O_{(I)} \leftrightarrow H_{3} {O^{+}}_{(a q)} + O {H^{-}}_{(a q)}$
$H y d r o n i u m i o n H y d r o x i d e i o n$

Auto-protolysis of water indicates its amphoteric nature i.e., its ability to act as an acid as well as a base. The acid-base reaction can be written as:

$H_{2} O_{(I)} + H_{2} O_{(I)} \leftrightarrow H_{3} O^{+} (a q) + O {H^{-}}_{(a q)}$
$(A c i d) (B a s e) (C o n j u g a t e a c i d) (C o n j u g a t e b a s e)$

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