======Acetylene From Calcium Carbide======


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**Materials: **{{$demo.materials_description}}\\
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**Safety: **{{$demo.safety_description}}\\
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**Alternative titles:** Combustion of Acetylene
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====Summary====                   
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====Procedure====  
  - Place small pieces of calcium carbide in a flask fitted with a delivery tube.  
  - Add water slowly to the flask to initiate the reaction.  
  - Collect the gas evolved (acetylene) by downward displacement of water.  
  - Use the gas immediately, as acetylene is unstable and highly flammable.  




====Links==== 
Laboratory Preparation of Acetylene (C2H2) Gas | CBSE Syllabus - Practical Science: 
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Lab. preparation of ACETYLENE gas - Practical CHEMISTRY | Flammable Gas - Science Sir: 
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📄 Spontaneous Combustion of Acetylene - UC San Diego: [[https://www-chem.ucsd.edu/undergraduate/teaching-labs/demos/demo22.html]]\\

====Variations====
  * Show the combustion of acetylene in air to demonstrate its sooty flame.  
  * Compare acetylene combustion with methane combustion to highlight differences between alkyne and alkane burning.  
  * Use acetylene in a reaction with chlorine (under safe, controlled conditions) to illustrate reactivity.



====Safety Precautions====
  * Wear safety goggles, gloves, and a lab coat.  
  * Handle calcium carbide carefully; it reacts violently with water to release flammable gas.  
  * Perform the reaction in a well-ventilated area or fume hood.  
  * Keep all flames and ignition sources away from acetylene until intended combustion.  
  * Dispose of calcium hydroxide residue safely as basic waste.




====Questions to Consider====
  * What happens when CaC₂ reacts with water? (It produces acetylene gas and calcium hydroxide.)  
  * What is the balanced chemical equation? (CaC₂ + 2H₂O → C₂H₂ + Ca(OH)₂.)  
  * What type of chemical reaction is this? (Hydrolysis reaction.)  
  * What are some uses of acetylene gas? (Welding, production of organic compounds, laboratory demonstrations.)  
  * Why must acetylene be collected and used immediately? (It is unstable and highly flammable.)