Diffusion of ammonia and hydrogen chloride

• Cotton wool soaked in aqueous ammonia is placed in one end of a glass tube, while another cotton wool soaked in hydrochloric acid is placed in the other end. The tube is to be closed at both ends.

• The gases react together to form solid ammonium chloride.

• The Mr of ammonia is 17, while the Mr of hydrogen chloride is 36.5; therefore, ammonia gas travels faster than hydrogen chloride gas.

• The white ring of ammonium chloride forms near the hydrochloric acid

Written by Peter Ngugi

Edited by: Yoshicaa

I would like to acknowledge Charis Liao and Rayhankhan Pathan for providing me with the resources and materials that supported the creation of these notes.