How is the ethylene prepared in laboratory? Give balanced equation and procedure. How is the gas prepared and dried?

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Solution

Ethylene is prepared in the laboratory from the reaction between ethyl alcohol and concentrated sulphuric acid (1 : 2) at 170^oC.

The reaction: ${CH}_{3} {CH}_{2} OH \to_{170 ° C}^{Conc . H_{2} {SO}_{4}} C_{2} H_{4} + H_{2} O$

The procedure involves taking one part of ethyl alcohol in a flask and adding two parts of sulphuric acid to it and then heating this mixture at 170^oC. Aluminium sulphate is also added in a small quantity to the flask, to avoid frothing. Ethylene is obtained by the downward displacement of water.

The gas is then passed through a sodium hydroxide column to remove impurities like carbon dioxide and sulphur monoxide.

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