What defines a strong base?

A strong base is defined by its ability to completely dissociate in water, leading to a high concentration of hydroxide ions in the solution. This complete dissociation results in a marked increase in the pH of the solution, making it very basic. Strong bases, such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), fully break apart into their constituent ions when dissolved in water, releasing hydroxide ions (OH-) and corresponding cations without any reversible reactions taking place. This direct and total dissociation is what enables strong bases to increase the hydroxide ion concentration effectively, which is the hallmark of their strength in aqueous solutions. This property differentiates them from weak bases, which only partially dissociate and therefore do not achieve high concentrations of hydroxide ions.