When current flows through a conducting solution, chemical reactions are caused. As a result, gas bubbles are formed on the electrodes.
Aim: To decompose water into hydrogen and oxygen
Procedure:
- 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 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.
