Which of the following statements about strong acids is true?

Strong acids are defined by their ability to completely dissociate into ions when dissolved in water. This means that when a strong acid is added to water, it breaks apart entirely into its constituent ions, releasing hydrogen ions (H⁺) into the solution and thus increasing the concentration of hydrogen ions in the solution.

This complete dissociation is what differentiates strong acids from weak acids, which only partially dissociate in water. For example, hydrochloric acid (HCl) is a strong acid that dissociates fully into H⁺ and Cl⁻ ions in an aqueous solution. The implication of this complete dissociation is that solutions of strong acids are characterized by very low pH values, typically ranging from 0 to 3, which contradicts any statement that implies a pH higher than 7.

In summary, the correct statement about strong acids is that they completely dissociate into ions in water, which leads to a high concentration of H⁺ ions and a correspondingly low pH.