Acids, Bases and Salts | Class 10 | Activity 2.3 with Solution

Activity 2.3  

CAUTION: 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 zinc granules?

✅ Answer: Hydrogen gas bubbles are formed on the surface of zinc granules.

• Pass the gas being evolved through the soap solution.
• Why are bubbles formed in the soap solution?

✅ Answer: Soap bubbles filled with hydrogen are formed.

• Take a burning candle near a gas-filled bubble.
• What do you observe?

✅ Answer: Hydrogen burns with a pop sound.

• Repeat this Activity with some more acids like HCl, HNO3 and CH3COOH.
• Are the observations in all the cases the same or different?

✅ Answer: Bubbles come out vigorously with strong acids. Zinc also reacts with weak acids like acetic acid, but gas is formed slowly.

• Activity 2.1
• Activity 2.2
• Activity 2.3
• Activity 2.4
• Activity 2.5
• Activity 2.6
• Activity 2.7
• Activity 2.8
• Activity 2.9
• Activity 2.10
• Activity 2.11
• Activity 2.12
• Activity 2.13
• Activity 2.14
• Activity 2.15

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