Ammonia water, also known as ammonia water, refers to the aqueous solution of ammonia, which is colorless, transparent and has a pungent odor. Ammonia water is volatile and has partial alkali permeability. It is prepared by passing ammonia into water. Industrial ammonia water is an aqueous solution containing 25%~28% ammonia. Only a small part of ammonia molecules in the ammonia water react with water to form ammonium ions and hydroxide ions, namely ammonia monohydrate, which is a weak base only existing in the ammonia water.