Hydrogen atoms can each form one covalent bond, and nitrogen atoms can each form three covalent bonds. Three pairs of electrons are shared in an ammonia molecule (NH3).
Ammonia solutions are used to clean, bleach, and deodorize. The ammonia sold for household use is a dilute water solution of ammonia in which ammonium hydroxide is the active cleansing agent.
Ammonia solutions are used to etch aluminum.
Ammonia solutions also are used to saponify (hydolyze) oils and fats