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Ethene is formed when ethanol at 443 K is heated with excess of concentrated sulphuric acid. What is the role of sulphuric acid in this reaction? Write the balanced chemical equation of this reaction.

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When ethanol is heated with excess of concentrated sulphuric acid at 170^{\circ}C, it gets dehydrated to form ethene.

The reaction is as follows:

CH_3CH_2OH \overset{Conc. H_{2}SO_{4}}{\rightarrow} CH_2 = CH_2 + H_2O

Concentrated sulphuric acid removes water from ethanol, thereby, acting as a dehydrating agent.

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