Ammonium Hydroxide, 28%

Ammonium hydroxide (Ammonia solution), also known as ammonia water, ammoniacal liquor, ammonia liquor, aqua ammonia, aqueous ammonia, or (inaccurately) ammonia, is a solution of ammonia in water. Aqueous ammonia is used in traditional qualitative inorganic analysis as a complexant and base. Like many amines, it gives a deep blue coloration with copper(II) solutions. Ammonia solution can dissolve silver oxide residues, such as that formed from Tollens' reagent. Although the name ammonium hydroxide suggests an alkali with composition [NH₄+][OH−], it is actually impossible to isolate samples of NH₄OH.