Lemon juice and other materials in ACIDS AND BASES – Class 7 Science Experiment

Chapter Name: ACIDS AND BASES

Activity Name: Lemon juice and other materials in ACIDS AND BASES

Activity Description:

Required Items:

1. Lemon juice
2. Marble pieces
3. Egg shells
4. Two test tubes
5. Lime water
6. Burning matchstick

Step by Step Procedure:

1. Take two test tubes and label them as “Marble” and “Egg shells.”
2. Pour some lemon juice into each test tube, one for marble and one for egg shells.
3. Add pieces of marble to the test tube labeled “Marble” and egg shells to the test tube labeled “Egg shells.”
4. Observe any changes that occur in each test tube.

Experiment Observations:

1. Test tube with marble and lemon juice: Effervescence occurs as gas is released.
2. Test tube with egg shells and lemon juice: Effervescence occurs as gas is released.
3. Carefully bring a burning matchstick near the mouth of each test tube and observe what happens.

Precautions:

1. Perform the experiment in a well-ventilated area or under a fume hood to avoid inhaling any potentially harmful gases.
2. Handle the burning matchstick with care to prevent accidents.
3. Use protective goggles and gloves to ensure safety.

Lesson Learnt from Experiment:

The experiment demonstrates the reaction of lemon juice with marble and egg shells, both of which are calcium carbonate-based materials. The reaction results in the production of carbon dioxide gas.

When the gas is passed into lime water, it forms a white precipitate, indicating the presence of carbon dioxide. This experiment illustrates the acidic nature of lemon juice, which reacts with calcium carbonate to release carbon dioxide gas.