Which of the following best describes a strong base?

A strong base is defined by its ability to completely dissociate in water to produce hydroxide ions (OH⁻). When a strong base is dissolved in water, it increases the concentration of OH⁻ ions significantly, leading to a high pH value, typically above 12. This property distinguishes strong bases from weak bases, which only partially dissociate, resulting in fewer hydroxide ions and a lower pH.

By fully dissociating, strong bases facilitate various chemical reactions and are often used in contexts requiring high pH, such as in neutralizing acids or in certain industrial processes. This complete dissociation directly correlates to their effectiveness in increasing the alkalinity of a solution.

Understanding the characteristics of strong bases helps clarify their role in acid-base chemistry, where the behavior of substances in solution is crucial for predicting outcomes in reactions.