Question

what happens when calcium carbide is treated with water ? give chemical equation for reaction.​

Answer 1

If we mix calcium carbide with water ethyne is released due to endothermic reaction between them. This is the industrial method of producing ethyne.

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

Answer 2

In this question use the chemical reaction that when CaC2reacts with water that is $CaC_2(s)+2H_2O(l)\Rightarrow C_2H_2(g)+Ca(OH)_2(g).$ The products on the right-hand side are the results of the reactants.

As we know calcium carbide is a solid element and the chemical formula of calcium carbide $=CaC_2$

Now as we know water is a liquid whose chemical formula$=H_2 O$

Now the chemical reaction of these two compounds is shown below,

$\Rightarrow CaC_2(s)+2H_2O(l)\rightarrow C_2H2_2(g)+Ca(OH)_2(g)$

Here we use one unit of calcium carbide and two units of water so the resultant product is acetylene $(C_2H_2)$ which is a gas.

So when calcium carbide reacts with water it produces acetylene.

So this is the required answer.

Hence option (C) is the correct answer.

Note $-C_2H_2$ thus formed over this reaction is also termed as ethyne formally known as acetylene. It is a hydrocarbon and the simplest alkyne. Acetylene is commonly used for welding and cutting. The welding that uses acetylene is also known as oxy-cutting or gas cutting. Acetylene is basically a colorless gas.

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