Chemical Reactions and Equations | Activity 1.9 with Solution

Activity 1.9

• Take three iron nails and clean them by rubbing with sand paper.
• Take two test tubes marked as (A) and (B). In each test tube, take about 10 mL copper sulphate solution.
• Tie two iron nails with a thread and immerse them carefully in the copper sulphate solution in test tube B for about 20 minutes [Fig. 1.8 (a)]. Keep one iron nail aside for comparison.
• After 20 minutes, take out the iron nails from the copper sulphate solution.
• Compare the intensity of the blue colour of copper sulphate solutions in test tubes (A) and (B) [Fig. 1.8 (b)].
• Also, compare the colour of the iron nails dipped in the copper sulphate solution with the one kept aside [Fig. 1.8 (b)].

Answer:

After 20 minutes, take out the iron nails. They become brownish in colour. Blue colour of CuSO₄ solution fades.

This is due to the following chemical reaction:

Here, iron has displaced by copper from CuSO₄ solution.

• Activity 1.1
• Activity 1.2
• Activity 1.3
• Activity 1.4
• Activity 1.5
• Activity 1.6
• Activity 1.7
• Activity 1.8
• Activity 1.9
• Activity 1.10
• Activity 1.11

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