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# 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: $\underset{\mathrm{Calcium}\mathrm{carbide}}{{\mathrm{CaC}}_{2}}+2{\mathrm{H}}_{2}\mathrm{O}\to \underset{\mathrm{Ethyne}}{{\mathrm{C}}_{2}{\mathrm{H}}_{2}}+\mathrm{Ca}\left(\mathrm{OH}{\right)}_{2}$ 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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