Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water?

A. Strong acid

B. Strong base

C. Weak acid

D. Weak base

Answer: weak acid

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C. Weak acid.

Explanation:

Generally, acids (weak or strong) dissociate to produce hydrogen ions, while bases (weak or strong) dissociate to produce hydroxide ions.

Strong acids ionize completely to produce hydrogen ions.

But, weak bases ionizes partially and gives off hydrogen ions when dissolved in water, they dissociate by a percent depending on the strength of the base.

So, the right choice is:

C. Weak acid.