National League for Nursing (NLN) Science Practice Exam

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The strongest acid can be found in which of the following pH ranges?

11.1−12.
7.1−8.2.
4.5−5.7.
1.0−2.0.

The correct answer is: 1.0−2.0.

The strongest acid is associated with the lowest pH values, indicating a higher concentration of hydrogen ions (H⁺) in the solution. A pH range of 1.0 to 2.0 signifies a highly acidic environment, where the concentration of hydrogen ions is significantly greater than in less acidic ranges. In contrast, the other ranges represent either neutral or basic conditions. A pH from 11.1 to 12 is characteristic of a strongly basic solution, indicating a low concentration of hydrogen ions. The range of 7.1 to 8.2 is close to neutral pH (which is 7) and signifies only mild acidity or basicity. Similarly, the range of 4.5 to 5.7 represents weak acids, which are not nearly as strong as those in the range of 1.0 to 2.0. Therefore, the choice that includes the pH of 1.0 to 2.0 accurately represents the environment of the strongest acids.