(1) Take one meter long narrow glass tube.
(2) Take two pieces of cotton wool.
(3) Soak one piece in yhydrochloric acid (HCl) Solution and another in ammonia (NH3) solution.
(4) Insert them separately at the two ends of the tube. Block the ends of the tube and observe.
(5) The hydrochloric acid (HCl) gives off (hydrogen chloride (HCl) and ammonia solution (NH3) gives off ammonia gas (NH3).
(6) Both gases react together to form a white fumes called ammonium chloride (NH4Cl) (White ring).
(7) The ring usually forms nearer to the HCl acid end of the tube because HCl diffuses more slowly than ammonia (NH3).
(8) Thus we can prove the speed of diffusion of NH3 is more than that of the speed of diffusion of HCl acid.
