Laboratory methods of preparation of Ozone

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 Laboratory methods of preparation -

Ozone is prepared by passing silent electric discharge through dry, pure and cold oxygen.

    3O² ---->  2O³, ∆H= + 68 Kcal.
       <---- 
Since the formation of ozone is endothermic, it requires high energy which is obtained by silent electric discharge. The silent electric discharge act like U.V. light and decompose ozone molecules into oxygen atoms which then recombines with the undissociated  oxygen molecules to form Ozone. This mixture obtained is called ozonised oxygen and the apparatus used to prepare ozone is known as ozoniser . Mainly there are two types of Ozonisers and known , 
1- Siemens Ozoniser 
2- Brodie's Ozoniser 
     

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