1. Take a glass tumbler half – filled with water and add a teaspoonful of Copper sulphate to it.
2. Now add a few drops of Sulphuric Acid to the Copper Sulphate solution.
3. Take some sample solution of it in another beaker and keep it aside.
4. Add an Iron nail to the solution in the first beaker and keep it undisturbed for half an hour.
5. Compare the colour of the solution in which iron nail is dropped to that of sample solution kept aside.
6. We notice that the blue coloured solution changes into green colour and a brown coloured deposit is seen on the iron nail.
7. The change in colour of the solution is due to the formation of Iron Sulphate, a new substance.
8. The brown deposit on the Iron nail is copper, another new substance.
9. Copper Sulphate (Blue) + Iron → Iron Sulphate (green) + Copper (brown deposit).
10. This is a chemical change.
