Final answer:
KOH, potassium hydroxide, is a strong base because it ionizes completely in water, dissociating into potassium and hydroxide ions.C) Strong base.
Step-by-step explanation:
KOH (potassium hydroxide) is classified as a strong base. Strong bases are those that ionize completely in an aqueous solution. KOH, being a hydroxide of an alkali metal, dissociates entirely into K+ and OH- ions when dissolved in water. This characteristic makes it a strong electrolyte. Therefore, when comparing the options given, KOH best fits as
Some other examples of strong bases include the hydroxides of other alkali metals such as NaOH and the heavier alkaline earth metals like Ba(OH)2. In contrast, weak bases do not ionize fully in solution. For example, NH3 (ammonia) is a weak base because it does not release OH- ions easily.
To summarize, potassium hydroxide is indeed a strong base because it is a soluble metal hydroxide that ionizes completely in water, providing hydroxide ions readily.