sulfuric acid is strong since when it was mixed with a base (e.g. NaOH), it

completely dissociates into ions, producing a large amount of heat and forming a salt (e.g. Na2SO4) and water. This is a characteristic of strong acids. They ionize completely in solution, meaning they give off a high concentration of hydrogen ions (H+), which makes the solution highly acidic. The reaction between sulfuric acid and sodium hydroxide is an example of a neutralization reaction, where an acid reacts with a base to produce a salt and water.