Electrolysis of Water

Electrolysis of Water

A considerable amount of energy is needed to get the atoms apart from each other. A battery can supply power. The water connects these terminals and acts as a bridge for energy flow.

Baking soda is added in this experiment to make it as an electrolyte. An electrolyte is a kind of solution which can be split by electrolysis. Electro refers to electricity and energy and lysis denotes splitting.

Apparatus Required

  1. Distilled Water
  2. Two thumbtacks
  3. 9V Battery
  4. Small plastic container
  5. Tap water
  6. Stopwatch
  7. 2 test tubes
  8. Sodium bicarbonate
  9. Lemon
  10. Salt (table salt)
  11. Detergent (dish wash detergent)


Step 1: Put the thumbtacks at the bottom of the container such that the points can be pushed up in the container. Keep the space between them same as the terminals of the battery.

Step 2: Keep the container over the battery terminals with the thumbtacks.

Step 3: Fill the container with distilled water slowly.

Step 4: Put a pinch of Sodium bicarbonate.

Step 5: Hold the test tubes over every pin to collect the gas and note your observations.

Step 6: Remove the solution and repeat the above procedure with different sets that include:

  • Distilled water and salt.
  • Distilled water and detergent.
  • Distilled water and lemon juice.
  • Only distilled water.
  • Only tap water.


The baking soda solution provides the right amount of electricity, and the settlement with salt gives the best electrolysis.

When baking soda dissolves in water, it allows current between the terminals through the water. The baking soda solution produces hydrogen (H2), carbon dioxide (CO2) and oxygen (O2) gases.

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Practise This Question

The boiling points of aldehydes and ketones lie in between alkanes and alcohols of comparable masses because: