Observing the diffusion of particles of solids into liquids in Matter Around Us – Class 9 Science Experiment

Chapter Name: Matter Around Us

Activity Name: Observing the diffusion of particles of solids into liquids in Matter Around Us

Activity Description:

In this experiment, we will observe the diffusion of particles of solids into liquids. Specifically, we will use potassium permanganate and copper sulfate crystals in separate trials to see how their particles diffuse into water.

Required Items:

  1. Beaker
  2. Water
  3. Small crystal of potassium permanganate
  4. Small crystal of copper sulfate

Step by Step Procedure:

  1. Take a clean beaker and fill it with water.
  2. In the first trial, add a small crystal of potassium permanganate to the water.
  3. In the second trial, add a small crystal of copper sulfate to the water.
  4. Observe and note down any changes that occur in both trials over a period of time.

Experiment Observations:

  • In the first trial with potassium permanganate, the crystal’s particles will start to diffuse into the water, resulting in the water turning a purplish color.
  • In the second trial with copper sulfate, the crystal’s particles will also diffuse into the water, causing the water to turn blue.


  1. Ensure that the beaker and all equipment used are clean to avoid any contamination.
  2. Handle the crystals with care and avoid direct contact with the skin.
  3. Perform the experiment in a controlled environment to avoid any external factors influencing the observations.

Lesson Learnt from Experiment:

The experiment demonstrates that particles of solids can indeed diffuse into liquids. Both potassium permanganate and copper sulfate crystals diffuse into the water, causing the water to change its color. This diffusion process indicates that even solids are made up of tiny particles that can move and mix with the particles of the liquid medium.

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