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Procedure
A mixture of ethanol and concentrated sulfuric acid in the ratio 1:2 respectively are heated in a flask to a temp. of 1600C – 1800C.
Observation
A colourless gas results; and is collected over water.
Reasons: Its insoluble, unreactive and lighter than water.
Explanation
At 1600C – 1800C the conc. H2SO4 dehydrates the ethanol, removing a water molecule form it and the remaining C and H atoms rearrange and combine to form Ethene which is collected as colourless gas.
Note: At temperature below 1400C, a different compound called ether is predominantly formed.
Ethene can also be prepared by passing hot aluminum oxide over ethanol. The later of which acts as a catalyst i.e.
Kavungya answered the question on April 27, 2019 at 12:23
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