1. Take a plastic mug. Drill two holes at its base and fit rubber stoppers in these holes. Insert carbon electrodes in these rubber stoppers as shown in figure.
2. Connect these electrodes to a 6 volt battery.
3. Fill the mug with water such that the electrodes are immersed. Add a few drops of dilute sulphuric acid to the water.
4. Take two test tubes filled with water and invert them over the two carbon electrodes.
5. Switch on the current and leave the apparatus undisturbed for some time.
6. You will observe the formation of bubbles at both the electrodes. These bubbles displace water in the test tubes.
7. The gas collected in test tube attached to cathode is twice in volume than the gas collected at anode.
8. Once the test tubes are filled with the respective gases, remove them carefully.
9. The burning match stick or candle when brought near to the test tube containing gas obtained at cathode, burns with a pop sound indicating the presence of hydrogen gas.
