Question

describe the process of making cooper sulphate crystal

Answer 1

1. Take a clean beaker and put the powdered impure sample of copper sulphate in it.

2. Add distilled water and stir the contents gently with the help of a glass rod.

3. In order to make the solution more clear add two or three drops of concentrated sulphuric acid in it.

4. Heat the solution in the beaker to 60-70 degree C on a wire gauze.

5. Stir it continuously and add more impure copper sulphate until no more of it dissolves.

6. Filter the solution and collect the filtrate in a china dish.

7. Place the china dish over wire gauze kept over a tripod stand and heat it gently.

8. As the solution gets heated, stir it with a glass rod. This helps in uniform evaporation and prevents the formation of a slid crust.

9. When the volume of the solution is reduced to one-half ,take out a drop of concentrated solution on one end of the glass rod and cool it by blowing air. Formation of thin crust indicates the crystallization  point is reached.

10. turn of the burner, cover the dish with a watch glass and keep it undisturbed. As the solution cools down crystals separate out. Slow cooling ensures better crystallization.

11. Decant the mother liquor and wash the crystals with a thin stream of cold water with the help of wash bottle.

12. dry the crystals by pressing them gently between sheets of filter paper