The hydrolysis of calcium carbide (CaC₂) to produce acetylene gas (C₂H₂) doesn't involve heat as a primary driver. It's actually an exothermic reaction, meaning it releases heat. Here's a breakdown:

The Reaction:

Calcium carbide reacts with water (H₂O) to produce acetylene gas and calcium hydroxide (Ca(OH)₂).

CaC₂ (s) + 2H₂O (l) → C₂H₂ (g) + Ca(OH)₂ (aq)

Explanation:

* Calcium carbide (CaC₂) is a highly reactive compound. It contains carbon atoms bonded to each other with a triple bond.

* Water (H₂O) acts as a reactant. The hydrogen atoms in water are attracted to the carbon atoms in calcium carbide.

* The reaction proceeds by the breaking of the triple bond in calcium carbide. This releases energy, making the reaction exothermic.

* Acetylene gas (C₂H₂) is formed. The carbon atoms from calcium carbide combine with hydrogen atoms from water to form the acetylene molecule.

* Calcium hydroxide (Ca(OH)₂) is also formed. This is a byproduct of the reaction, and it dissolves in water.

Heat's Role:

While the reaction itself releases heat, applying heat is not necessary to initiate the reaction. In fact, the reaction is quite vigorous and can even be explosive if the reaction rate is too fast.

Practical Application:

* This reaction is used industrially to produce acetylene gas.

* Acetylene is a flammable gas used for welding and cutting metals due to its high heat output.

Safety:

* Calcium carbide is a dangerous material, as it reacts violently with water.

* The reaction should always be performed in a well-ventilated area and with appropriate safety measures.