Activity 1.9 Class 10 Science -

Table of Contents

Activity

Aim of the activity

To study the displacement reaction between iron and copper sulphate

Material used in the activity

Iron nails
Sand paper
Test tubes
Copper sulphate solution
Thread

Activity 1.9 Class 10 Science

Procedure

We will take three iron nails and clean them by rubbing with sand paper. After that we will take two test tubes and mark them as (A) and (B). In each test tube, we take about 10 ml copper sulphate solution. We take two iron nails and tie them with thread and immerse them in the test tube B for about 20 minutes.

After 20 minutes, we take out the iron nails from the copper sulphate solution and compare the intensity of the blue colour of copper sulphate solutions in test tube (A) and (B) and also, compare the colour of the iron nails dipped in the copper sulphate solution with the one kept aside.

Observation

Initial observation

Copper sulphate solutions in both test tubes A and B are blue in colour and iron nails are shiny and metallic grey before experiment.

Activity 1.9 Class 10 Science observation

Observation after 20 minutes

The colour of copper sulphate solution remain unchanged in the test tube A and the colour of copper sulphate solution in test tube B becomes fade(light blue)

The iron nails immersed in the copper sulpahte solution turn brown while the nail kept aside remains unchanged.

Activity 1.9 Class 10 Science explanation

Explanation

When iron nail is immersed in the copper sulphate solution, a displacement reaction takes place.

Iron is more reactive than copper, so it displaced copper from copper sulphate solution and ferrous sulphate and copper are obtained.

Fe + CuSO4 →FeSO4 + Cu

Copper gets deposited on the iron nails that’s why they become reddish brown. The colour of copper sulphate becomes lighter due to formation of ferrous sulphate in the test tube.

Conclusion

This activity demonstrates the displacement reaction between iron and copper sulphate. We can easily know that iron is more reactive than copper through this activity.

FAQs

Why does the colour of the copper sulphate solution gets faded in the test tube B in the activity?

Ans – Iron displaces copper from copper sulphate and form iron sulphate which is light blue -green in colour.

Why do the iron nails turn reddish brown?

Ans – Copper metal gets deposited on the surface of iron nails that’s why they become reddish brown.

Why are the nails rubbed with sand paper?

Ans- The iron nails are rubbed with sandpaper to remove the rust or oxide layer on them so that they react with copper sulphate effectively.

What are the products formed in this activity?

Ans – Iron sulphate and copper metal

Which chemical reaction takes place in this activity?

Ans – Displacement reaction