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Experiment on Reaction of Iron with Copper Sulphate Solution in Water

A physical change occurs when there is no change in the composition of a substance and no change in the chemical nature of the substance.

The interconversion of state occurs during physical change.

SOLID ⇄ LIQUID ⇄ GAS

A chemical change is a change that causes a change in the chemical properties of matter, resulting in the formation of a new substance. As an example, consider the burning of oil or fuel.

Heat is evolved or taken in, the formation of bubbles, gas, and fumes, as well as a change in the colour of the reactants, can take place when they form a product.

Reactants → Products

A + B → C (Chemical reaction)

Table of Contents

  • Aim
  • Materials Required
  • Theory
  • Procedure
  • Observation
  • Result
  • Precautions
  • Frequently Asked Questions – FAQs

Aim

To carry out the reaction between Copper sulphate solution and water and Classify it as physical change and chemical changes.

Materials Required

Iron nails, Copper Sulphate solution, Test Tube, Clamp Stand, Sandpaper.

Theory

The colour of pure iron is greyish. Pure copper is a reddish-brown metal. The presence of Cu2+ ions causes the aqueous C solution of copper sulphate to be blue. The presence of Fe2+ ions causes the aqueous solution of ferrous sulphate to be pale green.

Since iron is more reactive than copper, it removes copper from its salt solution.

Procedure

1. Clean an iron nail by rubbing it with sandpaper until it is greyish.

2. Separate two test tubes and label them A and B. Add 10 mL of freshly prepared copper sulphate solution to each test tube and secure these test tubes in two separate clamp stands.

3. Thread the nail and hang it in test tube B. It is important to ensure that the iron nail is completely immersed in CuS04 solution. Tie the other end of the thread to the stand.

4. Keep the other iron nail on a piece of white paper.

5. Leave the setup alone for a while.

6. Take the nail out of the solution and place it along the side of the second iron nail on the sheet of paper.

7. Record your observations.

Observations

1. The brown coating on the iron nail indicates that copper is deposited on the iron nail as a result of iron displacement.

2. The colour of the blue colour copper sulphate solution changes to green.

3. The greenish colour of the solution in the test tube indicates the presence of Fe2+ ions in the solution.

4. This is a single displacement reaction in which copper is displaced by iron from copper sulphate solution, resulting in the formation of a new compound, ferrous sulphate.

5. A chemical change occurs as a result of the reaction.

Precautions

1. Clean iron nails by rubbing with sandpaper.

2. Copper sulphate solution is poisonous, so use caution when handling it.

3. The test tubes should not be touched or disturbed during the experiment.

4. After completing the experiment, the copper-coated iron nail should not be touched.

Frequently Asked Questions on Reaction of Iron with Copper Sulphate Solution in Water

What is the colour of copper sulphate solution?

The colour of the copper sulphate solution is blue.

Why are iron nails rubbed with sandpaper?

Iron nails are rubbed with sandpaper so as to remove any impurities present like rust, dust or greasy surface. Iron nails are rubbed with sandpaper so as to remove any impurities present like rust, dust or greasy surface.

Does the colour of the copper sulphate solution change?

Yes, the colour of the copper sulphate solution changes from blue to light greenish.

What does the greenish colour of the solution show?

The greenish colour of the solution shows that Fe2+ Ions are present in the solution.

What does the brown coating on the iron nails show?

The brown coating in the iron nail shows that copper is deposited in it by displacing iron.

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