- Take out two carbon rods from discarded cells and clean them with sandpaper.
- Make carbon rods as electrodes by connecting them to a battery after wrapping copper wire around them.
- Take a full cup of water in glass bowl or plastic bowl.
- Add few drops of lemon juice or a teaspoon of salt to the water. This will make it more conducting.
- Immerse the carbon rods into the water such that the metal caps of rod are outside the water.
- Wait for a few minutes.
You will observe gas bubbles near the electrodes. The hydrogen is formed on the negative electrode and Oxygen is formed on the positive electrode. These bubbles confirm the chemical effect of current on water and also that current passes through water.
