List of the Strong Acids

In chemistry, there are seven strong acids. What makes them strong is the fact that they completely dissociate into their ions (H and an anion) when they are mixed with water. Every other acid is a weak acid. Because there are only seven strong acids, it is easy to commit the list to memory. Note that some chemistry instructors may refer only to six strong acids. That typically means the first six acids on this list: HCl: Hydrochloric acidHNO3: Nitric acidH2SO4: Sulfuric acidHBr: Hydrobromic acidHI: Hydroiodic acid (also known as hydriodic acid)HClO4: Perchloric acidHClO3: Chloric acid As the strong acids become more concentrated, they may be unable to fully dissociate. The rule of thumb is that a  strong acid is 100 percent dissociated in solutions of 1.0 M or less.