Ethyne gas(Acetylene) is prepared in the laboratory by the action of water on calcium carbide.
CaC2 + 2H2O ----------> C2H2 + Ca(OH)2
Lumps of calcium carbide are placed on the layer of sand in conical flask fitted with a dropping funnel and delivery tube. Water is dropped from the dropping funnel whereby ethyne(acetylene) is formed. It is passed through the acidified solution of CuSO4 for the purification.
Figure: Laboratory preparation of Ethyne(Acetylene) gas
The ethyne gas prepared by the above method contains impurities of H2S, PH3, NH3, AsH3 etc. due to the contaminations of calcium carbide. Therefore, the gas is passed through acidified solution of CuSO4 which remove the impurities as follows:
CuSO4 + H2S ----------> CuS +H2SO4
3CuSO4 + 2PH3 ----------> Cu3P2 + 3H2SO4
2NH3 + H2SO4 ----------> (NH4)2SO4
3CuSO4 + AsH3 + 3H2O ----------> 3 Cu + H3AsO3 + 3H2SO4
The pure gas is then collected by downward displacement of water.
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