Question

Give an experiment to demonstrate diffusion

Answer 1

Experiment:

A beaker is almost filled with water. Some crystals of CuSO₄ or KMnO₄ are dropped carefully without disturbing water and is left as such for some time.

Observation:

The water is uniformly coloured, blue in case of CuSO₄ and pink in case of KMnO₄.

Inference:

The molecules of the chemicals diffuse gradually from higher concentration to lower concentration and are uniformly distributed after some time. Here, CuSO₄ or KMnO₄ diffuses independently of water and at the same time water diffuses independently of the chemicals.