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Strong Acids

A strong acid is one which reacts completely with water to produce hydronium ions. In other words, a strong acid is fully deprotonated in water.
HX(aq) + H2O(l) ---> H3O+(aq) + X-(aq)

If each molecule of strong acid in the animation represents one mole of HX, then in aqueous solution, we have six moles of hydronium ions and six moles of X- ions, and no moles of HX molecules.

The common strong acids are HCl, HBr, HI, HNO3, HClO4, HClO3, and H2SO4 (to HSO4-).