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One way of doing this experiment is to add a crystal of KMnO4 to a large beaker containing 1 litre of water and waiting. In the images the breaker on the right was at 65C and the one on the left at 12.9C.
The only problem with this experiment is that it is very difficult to quantify the rate of diffusion, so we are going to modify this experiment and use a colorimeter instead.