What overall characteristic do all strong bases share?

All strong bases share the characteristic of being soluble hydroxides. Strong bases, such as sodium hydroxide (NaOH) and potassium hydroxide (KOH), dissociate completely in water to produce hydroxide ions (OH⁻). This complete dissociation means that they contribute a significant amount of hydroxide ions to the solution, which is a defining feature of strong bases.

The solubility aspect is important because not all hydroxides are strong bases; only those that are soluble in water will function as strong bases. When these soluble hydroxides dissolve, they increase the concentration of hydroxide ions in solution, resulting in a high pH value. This is why solubility in water is a key characteristic shared by all strong bases.

In contrast to the other options, weak electrolytes would not conduct electricity well because they do not dissociate completely in solution. Additionally, strong bases do indeed conduct electricity due to the presence of free ions. Lastly, strong bases are not acids; rather, they are specifically defined by their ability to donate hydroxide ions and therefore behave oppositely to acids.