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Which of the following indicates a strong acid?

  1. pH of 7

  2. pH of 5

  3. pH of 2

  4. pH of 10

The correct answer is: pH of 2

A strong acid is characterized by its ability to dissociate completely in a solution, leading to a high concentration of hydrogen ions (H+) and, consequently, a low pH value. The pH scale ranges from 0 to 14, with lower values indicating higher acidity. A pH of 2 is indicative of a very acidic solution, which aligns with the properties of strong acids. In this case, the selection of a pH of 2 demonstrates a significant presence of hydrogen ions, signifying a strong acidic environment. Other pH values provided—7 being neutral, 5 being mildly acidic, and 10 being basic—do not illustrate the characteristics of a strong acid. Thus, a pH of 2 is the most relevant indicator of a strong acid.