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.

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