The degree of ionization of a weak acid I. varies with the concentration of the acid. II. depends on which weak acid it is. III. is 100%. IV. is greater than 50% but less than 100%.

The degree of ionization of a weak acid is greater than 50% but less than 100%.

Explanation:

An acid which dissociates partially or weakly when dissolved in water is called a weak acid.

For example, acetic acid is a weak acid.

Hence, the degree of ionization of a weak acid is greater than 50% but less than 100%.

Thus, we can conclude that the degree of ionization of a weak acid is greater than 50% but less than 100%.

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