Ammonium hydrate is a chemical compound with the molecular formula NH4OH. It is a colorless, pungent-smelling liquid used in a variety of industrial and laboratory applications. Ammonium hydrate is also known by various synonyms, such as ammonia water, ammonium hydroxide, and aqua ammonia. These synonyms reflect the compound's properties as an ammonia-based solution that is water-soluble and readily reacts with acids. Other synonyms include ammonic acid, azane, and hydrogen nitride. Overall, ammonium hydrate has a wide range of synonyms that reflect its various chemical and physical properties and its usefulness in many different applications.