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Question

How is ethyne (acetylene) prepared in the laboratory?

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Solution

Ethyne is prepared in the laboratory by the reaction of calcium carbide with water. The equation is:

CaC2Calcium carbide+ 2H2O ā†’C2H2Ethyne + Ca(OH)2

Take a few pieces of calcium carbide in a conical flask and then add a few drops of water to it. Ethyne gas is produced, which is collected by the downward displacement of water. Arrangement of apparatus is shown in the following figure:



To remove impurities like phosphene, ammonia and hydrogen sulphide from it, ethyne gas is passed through an acidified solution of CuSO4.

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