The Combustion of Acetylene

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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.

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)

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