* Why it's an acid: HCl completely dissociates in water, releasing H+ ions. The higher the concentration of H+ ions, the stronger the acid. HCl has a very high dissociation constant (Ka) of 1 x 10^7, which means it donates protons very readily.

2. Sulfuric acid (H2SO4)

* Why it's an acid: H2SO4 is a diprotic acid, meaning it can donate two protons per molecule. It dissociates in water to form H+ ions and HSO4- ions. The first dissociation is very strong, with a Ka of 1 x 10^2, while the second dissociation is weaker, with a Ka of 1 x 10^-2.

3. Nitric acid (HNO3)

* Why it's an acid: HNO3 is a strong acid that completely dissociates in water, releasing H+ ions and NO3- ions. It has a very high Ka of 1 x 10^6.

Additional notes:

* All of these acids are corrosive to skin and tissue.

* Strong acids can react with metals to produce flammable hydrogen gas.

* Strong acids should always be handled with caution and proper protective equipment.