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Question

What do you understand by hydrolysis? Explain giving examples.

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Solution

Hydrolysis is the process in which a salt and water react to form an acidic or basic solution.
In the process of hydrolysis, only those salts hydrolyse which are formed by the reaction of

  • strong base and weak acid
  • strong acid and weak base

This happens because a salt formed due to a strong base and a weak acid on dissolving in water will form a basic solution.
A basic solution turns red litmus blue.
Na2CO3+ 2H2O 2NaOH + H2CO3

However, the salt formed due to a strong acid and a weak base on dissolving in water will make an acidic solution. Acidic solutions turn blue litmus red.
FeCl3+ 3H2O Fe(OH)3+ 3HCl


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