Speed of diffusion of two gases in Matter Around Us – Class 9 Science Experiment

Chapter Name: Matter Around Us

Activity Name: Speed of diffusion of two gases in Matter Around Us

Activity Description:

Speed of diffusion of two gases in Matter Around Us - Class 9 Science Experiment

The aim of this experiment is to observe the speed of diffusion of two gases, hydrogen chloride gas (from hydrochloric acid) and ammonia gas (from ammonia solution). When these gases diffuse and come into contact with each other, they react to form a white substance called ammonium chloride.

Required Items:

  1. Glass tube with scale (approximately 1 meter long)
  2. Ammonium Solution
  3. Hydrochloric acid
  4. Pieces of cotton wool
  5. Rubber cork

Step by Step Procedure:

  1. Take a 1-meter-long narrow glass tube.
  2. Soak one piece of cotton wool in hydrochloric acid solution.
  3. Soak another piece of cotton wool in ammonia solution.
  4. Place the two cotton wool pieces separately at the two ends of the glass tube.
  5. Block the ends of the tube with rubber corks.
  6. Observe the glass tube over time.

Experiment Observations:

As time passes, the hydrogen chloride gas from the hydrochloric acid and the ammonia gas from the ammonia solution will diffuse through the cotton wool and travel towards the center of the glass tube. When these two gases come into contact at the center of the tube, they react to form a white substance called ammonium chloride.


  1. The teacher should handle hydrochloric acid and prevent children from touching it as it is a corrosive and harmful substance.
  2. The experiment should be conducted in a well-ventilated area or under a fume hood to ensure safety.

Lesson Learnt from Experiment:

Through this experiment, students will learn about the concept of diffusion, which is the movement of particles from an area of higher concentration to an area of lower concentration. They will also observe how different gases can mix and react with each other when they come into contact. This activity helps students understand the properties of gases and the process of diffusion.

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