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                  Electrolysis  of  water

 Electrolysis of water is an example of decomposition reaction in which waterr breaks up into it's constituents. Let perrform an activity to demonstrate electrolysis of water.


                                Activity

  • Take a plastic mug. drill holes at it's base and fit rubber stoppers in these holes. insert carbon electrodes in these rubber stoppers .
  • Connect these electrodes to a 6 volt battery.
  • Fill the mug with water such that the electrodes are immersed. Add a few drops of dilute sulphuric acid to the water.
  • Take two test tubes filled with water and invert them over the two carbon electrodes.
  • switch on the current and leave the apparatus undisturbed for some time.
  • you will observe the formation of bubbles at both the electrodes. These bubbles displace water in the test tubes.
  • Is the volume of the gas collected the same in both the test tubes ?
  • Once the test tubes are filled with the respective gases, remove them carefully.
  • Test these gases one by one by bringing a burning candle close to the mouth of the test tubes.        
                               Caution
  • These all the steps must be done carefully under adult supervision.
           
                           Conclusion 

From above activity we will see the evolution of hydrogen and oxygen from the water.


    
                                    
     




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