Ammonium chloride can be placed in the middle of a glass tube with both ends open at an angle. After heating, the ammonium chloride decomposes, and the separation of ammonia and hydrogen chloride is achieved according to the density (the density of ammonia is relatively small, so it will The upper opening of the glass tube escapes, while hydrogen chloride escapes from the lower opening). However, this separation method can easily collect impure products.
You can also mix ammonium chloride and concentrated sulfuric acid and heat it. When the ammonia is generated, it will be directly absorbed by the sulfuric acid, and the hydrogen chloride will escape.