Activity 2.3 Class 10 Science

 This activity explains the reaction between metals and acids. The reactivity of different metals with different acids may vary.

Reaction of Metals with Acids

Aim of the Activity

To observe the reaction between zinc and sulphuric acid and the nature of the evolving gas.

Procedure

 1)  Set the apparatus as shown in the figure.

2)  Take about 2 ml of dilute sulphuric acid in a test tube and add a few pieces of zinc granules to it.

3)  What do you observe on the surface of zinc granules?

4)  Pass the gas being evolved through the soap solution.

5)  Why are bubbles formed in the soap solution?

6)  Take a burning candle near a gas-filled bubble.

7)  What do you observe?

8)  Repeat this activity with some more acids like HCI, HNO_3, and CH₃COOH.

9)  Are the observations in all the cases the same or different?

Observation

When we bring a burning candle near a gas-filled bubble the gas burns with a popping sound.

Conclusion

Zinc metal displaces hydrogen from sulphuric acid.

Zn+ H₂SO₄ → ZnSO₄ +H₂↑

Caution: This activity needs the teacher’s assistance. 

Frequently Asked Questions

1.  Which gas is evolved when metal reacts with an acid?

   Ans.- Hydrogen gas is evolved when a metal reacts with an acid.

2.  Which reaction takes place in activity ?

   Ans.- Displacement reaction takes place in this activity. Zinc displaces hydrogen from sulphuric acid.

3.  What is the definition of ‘Displacement reaction’?

   Ans. - The reaction in which on an atom or a group of atoms of one compound is displaced by one atom or a group of atoms, is called displacement reaction.

4.  Write the equation for the chemical reactions that takes place in activity.

   Ans.- Zn+ H₂SO₄ →ZnSO₄ +H₂↑

 

5.  Why burning candle is brought near the bubbles evolve from soap solution?

    Ans. To identify the evolving gas, a burning candle is brought near the bubbles. They burst with a pop sound. So the gas filled in the bubbles is hydrogen.

6.  Why are the bubbles formed in the soap solution in activity?

    Ans.- Hydrogen gas tries to escape from the soap solution. When hydrogen gas enters a soap solution, it forms

 bubbles

Related Topics -

1. Activity 2.4

2. Activity 2.2

2. Solutions of Chapter 2 

3. MCQ Questions of Chapter 2

4. Extra Questions of Chapter 2