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Topic Content:
- Laboratory Preparation of Ethene
- Industrial Preparation of Ethene
- Physical Properties of Ethene
- Chemical Properties of Ethene
- Uses of Ethene
Alkenes are a homologous series of unsaturated hydrocarbons with a general molecular formula – CnH2n. Alkenes contain carbon-to-carbon double bonds and are sp2 hybridized. The bond angle between carbon and hydrogen is 121.3°. Alkenes are also more reactive than alkanes because of the availability of electrons in the double bonds.
Laboratory Preparation of Ethene:
Ethene is prepared in the laboratory by dehydration of ethanol. Ethanol is heated with an excess of concentrated tetraoxosulphate(VI) acid at a temperature of 170°C. The gases produced are passed through sodium hydroxide solution to remove the carbon(IV) oxide and sulphur(IV) oxide produced from side reactions.
The reaction occurs in two stages. On mixing ethanol and concentrated tetraoxosulphate(VI) acid in a volume ratio of 1:2 respectively, ethyl hydrogentetraoxosulphate(VI), is formed.
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