Thursday, August 11, 2011

Preparation of Ozone

2O2 + O2 ↔ 2O3 ; DH = +288KJ

Effect of concentration
On increasing the concentration of oxygen, the equilibrium will shift toward right i.e. forward reaction is favoured. If the concentration of ozone is increased, the equilibrium will shift towards left i.e. backward reaction is favoured.

Effect of Temperature
The formation of ozone is endothermic reaction i.e. forward reaction is endothermic whereas backward reaction is exothermic reaction. So on increasing temperature forward reaction will be favoured and if temperature is decreased, backward reaction is favoured.

Effect of Pressure
On increasing pressure, forward reaction is favoured because it involves decreases in number of moles. If pressure is decreased, the backward reaction is favoured, because it involves increase in number of moles.

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