Here's why:

* Structure: HClO3 is the chemical formula for chloric acid. It contains a hydrogen atom (H) bonded to an oxygen atom (O) within an oxyanion (ClO3-).

* Dissociation in water: When dissolved in water, chloric acid releases a hydrogen ion (H+) and a chlorate ion (ClO3-):

HClO3 (aq) → H+ (aq) + ClO3- (aq)

* Definition of an acid: Acids are substances that donate protons (H+ ions) when dissolved in water.

Let me know if you have any other chemistry questions!