Question

Why acetic acid is called weak acid though there are four H atoms in the molecule ?​

Answer 1

Answer:

Only one of the four H atoms of the CH3COOH is released as H+ ion in solution. So acetic acid is called weak acid and also acetic acid does not undergo complete ionisation.

Explanation:

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Answer 2

Though acetic acid has four hydrogen atoms, only one of the  four hydrogen atoms is released as Ht ion in solution. So, it is a weak acid.