Which of these definitions could be used to define KOH as a base? Check all that apply.

KOH dissociates in water to produce OH⁻ ions, so it fits the Arrhenius definition of a base. The OH⁻ ions can accept H⁺, making KOH a Brønsted–Lowry base, and they can donate an electron pair, making it a Lewis base. Thus all three concepts can be used.

AI-written and checked against the verified answer.