Question

1) Sodium chloride undergoes an electrolysis reaction producing two new substances. One is a metal and the other is a gaseous element.
a) Create a word equation

b) Create a skeleton equation

c) Balance each equation

Answer 1

Metallic sodium and chlorine gas are produced by the electrolysis of molten sodium chloride.

What is a word equation?

A word equation represents a chemical reaction using the names of the substances involved.

a) Word equation:

Sodium chloride + electrolysis →  Sodium hydroxide + Hydrogen gas, Chlorine gas

b) The following reactions take place during the electrolysis of brine solution :

NaCl =$Na^+ +Cl^-$

$H_2O$ =$H^+ +OH^-$

Now there are two cations and two anions which get discharged in the following way :

At cathode : $2H^+ +2e^-$ = $H_2$

At anode: $2Cl^- - 2e-$=$Cl_2$

The remaining ions

$Na^+ +OH-$ = NaOH

That's why we get $H_2$, $Cl_2$ and NaOH.

c) Balance each equation is:

2NaCl (l)  →   2Na(s) + $Cl_2$(g)

Learn more about the word equation here:

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