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What Do You Understand by the Term ’Auto-protolysis’ of Water? What is Its Significance? - Chemistry

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ConceptWater Chemical Properties of Water

Question

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

Solution

Autoprotolysis (self-ionization) of water is a chemical reaction in which two water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).

The reaction involved can be represented as:

`H_2O_(l) + H_2O_(l) " ↔ " H_3O_((aq))^(+)        +           OH_((aq))^(-)`

                         Hydronium ion  Hydrooxide ion

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_2O_(l)      +        H_2O_(l) " ↔     " H_3O_((aq))^(+)                              + OH_((aq))^-` 

(Acid)          (Base)       (Conjugate acid)  (Conjugate acid) 

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Solution What Do You Understand by the Term ’Auto-protolysis’ of Water? What is Its Significance? Concept: Water - Chemical Properties of Water.
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