When it come to essay writing, you need to use suitable chemicals which show changes in colour before and after diffusion process is completed.
The picture below shows diffusion of potassium manganate (VII) which is purple in colour in water.
The test tube on the right was left for 30 minutes, the one in the middle was a day, and the one furthest to the left was two days.
In exam, you might be asked to explain the observation by using kinetic theory of matter. (3 marks)
Make sure you use the right keywords in the right sequence.
Answer:
{The ions of manganate (VII) which are small and discrete, move and collide randomly from high concentration area to low concentration area.}
