3. Complete Activity 1.3 (Page 2).
- Take a few zinc granules in a conical flask or a test tube.
- Add dilute hydrochloric acid or sulphuric acid to this (Fig. 1.2). CAUTION: Handle the acid with care.
- Do you observe anything happening around the zinc granules?
- Touch the conical flask or test tube. Is there any change in its temperature?
Answer:
Aim: To observe what happens dilute hydrochloric acid or sulphuric acid is added to zinc granules in a conical flask and make the necessary conclusions.
Materials Required: Conical flask, zinc granules, dilute hydrochloric acid or sulphuric acid.
Procedure:
(i) Few zinc granules are taken in the conical flask.
(ii) Dilute hydrochloric acid or sulphuric acid is added to it carefully.
(iii) Note what happensaround the zinc granules and if the temperature of the flask changes.
Observations:
- Bubbles are seen around the zinc granules.
- The flask is observed to become hot.
Conclusions:
- Hydrogen gas is evolved as is indicated by the bubbles, indicating that a chemical reaction has taken place.
- Also, heat is evolved, further indicating that a chemical reaction has taken place. The reactions are shown below:
Zn + 2HCl —> ZnCl2 + H2
Zn + H2SO4 —> ZnSO4 + H2
“Complete Activity 1.3 (Page 2).
Take a few zinc granules in a conical flask or a test tube.
Add dilute hydrochloric acid or sulphuric acid to this (Fig. 1.2). CAUTION: Handle the acid with care.
Do you observe anything happening around the zinc granules?
Touch the conical flask or test tube. Is there any change in its temperature?” – Solved.
Related Links:
Solution to Group Activity
Solution to Activity 1.1
Solution to Activity 1.2
Solution to Activity 1.3
Solution to Activity 1.4
Solution to Activity 1.5
Solution to Activity 1.6
Solution to Activity 1.7
Solution to Activity 1.8
Solution to Activity
Solution to Activity 1.9
Solution to Activity 1.10
Solution to Activity 1.11
