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Question

Acetic acid (CH3COOH) is a weak acid because:


  1. it is formed by reaction between a weak oxide and water.

  2. it gets partially ionised in water.

  3. it is produced slowly from vinegar.

  4. it contains only four hydrogen atoms.


Solution

The correct option is B

it gets partially ionised in water.


Acetic acid (CH3COOH) ionises partially in water, hence, it is a weak acid. In other words, molecules of a weak acid ionises partially into corresponding ions, and the rest remain as simple acid molecules in water. The dissociation occurs as follows:

CH3COOH(aq)CH3COO(aq)+H+(aq)

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