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Explain the following giving suitable re...

Explain the following giving suitable reasons: In the manufacture of `H_2SO_4` by contact process:
For the production of concentrated sulphuric acid, `SO_3` is not directly dissolved in water. 

Text Solution

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`SO_3` is not directly dissolved in water as :
(i) Reaction is highly exothermic .
(ii) `SO_3` does not form a homogenous mixture with water.
(iii) A dense fog of sulphuric acid particles is formed and it may cause disease. "Phossy jaw".
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