Final answer:
HClO₃, known as chloric acid, is classified as a strong acid because it completely dissociates into ions in aqueous solutions.
Step-by-step explanation:
The substance HClO₃ is a strong acid. In general, acids that completely dissociate in water are considered strong acids. HCl for example, dissociates completely into H+ and Cl- ions, making it a strong acid. Similarly, HClO₃, chloric acid, is also known for its complete dissociation in aqueous solutions which is why it categorically falls under the class of strong acids.
It's important to remember that strong acids have very weak conjugate bases, which in the case of HClO₃, would be the chlorate ion (ClO₃-). This ion has very little tendency to accept a proton and reform HClO₃, thus, confirming the strength of chloric acid.