| Section2 = }} In chemistry, hydroxide is the most common name for the diatomic anion OH−, consisting of oxygen and hydrogen atoms, usually derived from the dissociation of a base. It is one of the simplest diatomic ions known. Inorganic compounds that contain the hydroxyl group are referred to as hydroxides. Common hydroxides include: Sodium hydroxide (NaOH) Potassium hydroxide (KOH) Calcium hydroxide (Ca(OH)2) Hydroxide as a base Most compounds containing hydroxide are bases. An Arr… (More on Hydroxide)