# Preparation and Properties of ozone

Ozone in lab is prepared by passing silent electric discharge through pure and dry oxygen in a special apparatus called ozonizer.
$$\ce{3O2->[\text{Electric discharge}]2O3 + 284KJ/mole}$$

This reaction is exothermic in nature. Two types of ozonizer is used in preparation of ozone in lab.

a. Simen’s Ozonizer

b. Brodie’s Ozonizer

a. Simen’s Ozonizer: The apparatus consists of two co-axial glass tube coated with tin foil in the inner side of the inner tube and outer side of outer tube. The inner and outer tin coating is connected to the terminal of the induction coil. A slow current is passed through the annular space which causes the silent electric discharge. This ozone is 10-15 percent pure. The yield of oxygen can be increased by passing pure and dry oxygen at low pressure and high temperature.The reaction involved in Simen’s ozonizer are:
$$\ce{O2->[\text{UV radiation}]O + O}$$
$$\ce{O2 + O->O3}$$

Simen’s Ozonizer

Brodie’s Ozonizer: This ozonizer works on the same principle as that of Simen’s ozonizer. It uses dilute H2SO4 instead of tin foil. In this ozonizer, two carbon or platinum electrodes are dipped in sulphuric acid solution. A slow current is passed through the annular space which causes the silent electric discharge. This ozone thus obtained is 15-20 percent pure.

Brodie’s Ozonizer

Physical properties of ozone:

– Ozone in gas is a pale light blue color and liquid in deeper blue.
– It is 1.5 times heavier than air.
– It has characteristics fishy smell.
– It is slightly soluble in water and highly soluble in turpentine oil and acetic acids.
– It is highly poisonous.
– It is more powerful oxidizing agent than oxygen.

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#### 2 Responses to “Preparation and Properties of ozone”

1. Katigho Abel

Thanx for educating us on ozone as a gas,then what about the ozone layer below the sun?

2. DEBSARAN MOHAPATRA

What is retard reaction?