Which of the following is NOT a characteristic of strong bases?

Which of the following is NOT a characteristic of strong bases?

• A. High pKa value
• B. Complete ionization in solution
• C. Water solubility
• D. Basicity in aqueous solutions

Answer: (A)

The characteristic of strong bases includes their ability to completely dissociate in aqueous solutions, producing hydroxide ions (OH⁻) that lead to a high pH. Strong bases are usually soluble in water and yield a high concentration of hydroxide ions when dissolved. Basicity in aqueous solutions is a defining trait, as the strength of a base is often determined by how effectively it increases the pH of a solution. When considering pKa values, strong bases have very low pKa values, often negative, because they are strong proton acceptors and therefore have a tendency to deprotonate very easily. A high pKa value typically corresponds to weak acids, reflecting a weaker tendency to donate protons. Thus, the statement regarding a high pKa value being a characteristic of strong bases is incorrect, as it contradicts the fundamental definition of base strength and behavior in solutions.

The characteristic of strong bases includes their ability to completely dissociate in aqueous solutions, producing hydroxide ions (OH⁻) that lead to a high pH. Strong bases are usually soluble in water and yield a high concentration of hydroxide ions when dissolved. Basicity in aqueous solutions is a defining trait, as the strength of a base is often determined by how effectively it increases the pH of a solution.

When considering pKa values, strong bases have very low pKa values, often negative, because they are strong proton acceptors and therefore have a tendency to deprotonate very easily. A high pKa value typically corresponds to weak acids, reflecting a weaker tendency to donate protons.

Thus, the statement regarding a high pKa value being a characteristic of strong bases is incorrect, as it contradicts the fundamental definition of base strength and behavior in solutions.