Make your own cell in Electrical Conductivity of Liquids – Class 8 Science Experiment

Chapter Name: Electrical Conductivity of Liquids

Activity Name: Make your own cell in Electrical Conductivity of Liquids

Activity Description:

Required Items:

1. Two injection bottles
2. Two 5 cm-long pieces of thick copper wire
3. Sandpaper
4. Zinc strips (cut from the outer metal covering of a dry cell)
5. Rubber caps for the injection bottles
6. Dilute sulfuric acid
7. LED
8. Wires for connecting the LED to the cell

Step by Step Procedure:

1. Cut two 5 cm-long pieces of thick copper wire and scrape about 1 cm of the coating from both ends using sandpaper.
2. Cut two 2 mm-wide and 5 cm-long strips from the zinc plate of a depleted dry cell.
3. Insert the copper wires and zinc strips into the rubber caps of the injection bottles, ensuring they do not touch each other.
4. Connect the copper wire of one bottle with the zinc plate of the other bottle using a wire.
5. Fill both bottles carefully with dilute sulfuric acid while the caps with the copper wires and zinc strips are inserted.
6. The cell is now ready for testing.

Experiment Observations:

1. When connecting an LED to the cell and touching one wire to the zinc plate and the other wire to the copper wire, the LED may light up if the connections are correct.

Precautions:

1. Handle the sulfuric acid with care as it is corrosive and can cause harm to the skin and eyes.
2. Ensure the copper wires and zinc strips do not touch each other inside the bottles.
3. Take necessary precautions when working with electricity and connecting the LED to the cell.

Lesson Learnt from Experiment:

1. Electrochemical cells can be constructed using simple materials and liquids to generate electricity.
2. Certain liquids, such as sulfuric acid, lemon juice, tamarind juice, and tomato juice, can act as electrolytes in the cell.