Ammonia is prepared in the laboratory by heating ammonium salt with sodium hydroxide. Ammonia gas can be recognized by its smell and its ability to convert the color of humid litmus paper from red to blue. For example, it can be prepared by heating ammonium chloride with dry slaked lime or sodium hydroxide.
Trihydrogen ammonia, ammonia, ammonia gas or ammonia spirit (Arabic-Persian, ammonia or nouazar) is a colorless alkaline gas. It is made up of one nitrogen atom and three hydrogen atoms.
Ammonia is lighter than air and has a distinctive pungent odor. Its chemical formula is NH3, and it is prepared by distilling coal or some nitrogenous substances.
Ammonia doesn’t burn in air, but it burns in oxygen resulting in a pale yellow flame.