What is the difference between a strong acid and a weak acid?
Strong acid :
A strong acid is completely (100%) ionised. An example of a strong acid is hydrochloric acid. A strong acid has a pH of 1. hydrogen chloride (in water) hydrogen ion + chloride ion. HCl(aq) H+(aq) + Cl-(aq).
Examples of strong acids
hydrochloric acid(HCl), hydroiodic acid (HI), hydrobromic acid (HBr), perchloric acid (HClO4), nitric acid (HNO3) and sulfuric acid (H2SO4). In aqueous solution, each of these essentially ionizes 100%. ... At equilibrium, both the acid and the conjugate base are present in solution.