Question

2.1.2 How do Acids and Bases React with Metals?
Activity 2.3
This activity needs the teacher's assistance.
Set the apparatus as shown in Fig. 2.1.
Take about 5 ml of dilute sulphuric acid in a test tube and add a
few pieces of zinc granules to it
What do you observe on the surface of zine granules?
Pass the gas being evolved through the soap solution
Why are bubbles formed in the soap solution?
Take a burning candle near a gas filed bubble.
What do you observe?
Repeat this Activity with some more acids like HCI, HNO, and
CH.COOH
Are the observations in the cases the same or different?​

Answer 1

Answer:

When dilute sulphuric acid is added to zinc,it loses its lustre and turns black.

The bubbles are formed because gas passes is trapped in soap water and as it is lighter than air it forms bubbles and floats.

When candle is brought near the bubbles the gas catches fire and burns with a pop sound this shows that the gas is hydrogen.

Yes,the observations in the case of HCl,HNO CHOOCH is same.

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