Aim: To observe the speed of diffusion of two gases.
Materials required : Long glass tube with scale, liquid ammonia,
Hydrochloric acid (HC), pieces of cotton, two rubber corks and two tongs.
Procedure:
1. Take a one meter long narrow glass tube.
2. Take two pieces of cotton wool.
3. Soak one piece of cotton wool in HCl solution.
4. Soak another piece of cotton wool in NH solution.
5. Insert them separately at the two ends of the tube with the help of tongs.
6. Close the ends of the glass tube with rubber cork and observe.
7. The HCl gives off hydrogen chloride gas and ammonia solution gives off ammonia gas.
Observation:
1. Both gases react together to form a white ring in the tube due to formation of ammonium chloride.
2. Measure the distance of white ring from two ends of the glass tube.
Explanation:
We can observe that the ammonia gas travelled faster. So that the distance of white ring is more from ammonia end than hydrochloric acid end.
