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Chemistry LibreTexts

The Combustion of Acetylene

  • Page ID
    3067
  • Chemical Concept Demonstrated

    • Chemistry of alkynes

    Demonstration

    Crushed ice is covered over the bottom of a beaker.

    Calcium carbide (CaC2) is sprinkled over the ice.

    A match is dropped into the beaker.

    acety.gif

    Observations

    An exothermic reaction occurs.

    Explanation (including important chemical equations)

    Calcium carbide reacts with water to form acetylene.

    CaC2 (s) + H2O (l) --> Ca2+ (aq) +2 OH- (aq) + H2C2 (g)

    In the presence of a flame, acetylene reacts with oxygen to form carbon dioxide and water.

    2 H2C2 (g) + 5 O2 (g) --> 4 CO2 (g) + 2 H2O (g)

    Contributors

    • Dr. George Bodner