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Preparation of Ethene in Lab

Principle

Ethane can be prepared in a laboratory by heating ethanol (or ethyl alcohol) with excess of concentrated sulphuric acid at 160-170°C.

C2H5OH + H2SO4CH2 -------》 CH2 + H2O

Conditions

Catalyst= conc. H2So4

Temperature =160-170°C

Process

A mixture of ethanol and sulphuric acid is taken in RB flask. A small amount of aluminium sulphate and and is taken in flask; to facilitate dehydration and prevent frothing. Now, free end of delivery tube is dipped into a wash bottle containing sodium hydroxide solution. Te impurities like carbon dioxide and sulphur dioxide are removed here. Pure ethane is collected by downward displacement of water.