Q- Describe diffusion with an experiment?
Answer- Diffusion is the process of spontaneous movement of materials from a region of higher concentration or diffusion pressure to a region of lower concentration or diffusion pressure due to tendency of their molecules to spread uniformly.
Experimental Proof of Diffusion:
To prove the process of diffusion we need to prove the movement of non-electrolytes along their concentration gradients. To prove the movement of non-electrolytes along their concentration gradients we had to do the following experiment:
Procedure: Place a crystal of copper sulphate in the corner of bottom of a beaker half full with water.
Observation: After some time, the water will become blue in colour due to diffusion of the particles of crystals of copper sulphate.
Conclusion: The molecules of copper sulphate slowly diffuse on all the sides until these are uniformly distributed in the beaker of water. This proves that uncharged molecules (i.e non-electrolytes) move along their concentration gradient.