The Behaviour of Matter - Observing Diffusion
Aim: To observe diffusion in a liquid
Method:
1. Half fill your petri dish with cold tap water.
2. Place the petri dish on your work bench and allow the water to become settled.
3. Using the tweezers, place a single crystal of potassium permanganate in the centre of the petri dish.
4. Observe for 5 minutes.
5. Repeat the experiment using hot water.
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Observations:
In cold water: The KMnO, slowly diffuses into the water turning it purple.
In hot water: The KMnO, rapidly diffuses into the water.
Explanation: The particles in hot water are moving about more quickly than the particles in the cold water. This increased particle movement increases the rate of diffusion.
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