Formula: NH4OH

Synonyms: Ammonia aqueous; Ammonia water; Aquammonia

Ammonium hydroxide, also known as ammonia water, aqueous ammonia, or simply ammonia solution, is a solution of ammonia (NH₃) in water (H₂O). It's a weak base and has a characteristic pungent odor.

It has numerous industrial applications due to its alkalinity and chemical reactivity, including: Household and industrial cleaning products, production of ammonium salts, which are used as fertilizers, manufacture of plastics, synthetic fibers, and other chemicals, refrigerant in industrial refrigeration systems and reagent in various chemical analyses and syntheses.