Metallic sodium is extracted by the electrolysis of brine (aq. NaCl).

1.	Metallic sodium is extracted by the electrolysis of brine (aq. NaCl). After electrolysis the electrolytic solution becomes basic in nature. Write the possible electrode reactions.
Answer» Brine is a solution of sodium chloride (molten state): The process of electrolysis involves using an electric current to bring about a chemical change and make new chemicals. In the electrolysis of brine, sodium ions migrate to the cathode, where electrons enter the melt and are reduced to sodium metal. Na + e → Na (at cathode) Chloride ions migrate the other way toward the anode. They give up their electrons to the anode and are oxidised to chlorine gas. Cl^- → \(\frac{1}{2}\)Cl₂ + e^- (at node) Overall reaction: 2NaCl → 2Na(s) + Cl₂ (g) For aqueous solution of NaCl: H₂O + 2e^- → H₂↑ + 2OH^- (at cathode) Cl^- → \(\frac{1}{2}\) Cl₂ + e^- (at anode) Overall reaction: NaCl (aq) + H₂O(1) → Na⁺(aq) + OH^- (aq) + H₂(g) + \(\frac{1}{2}\)Cl₂(g) After electrolysis the electrolytic solution becomes basic in nature. [Due to formation of hydroxide (OH^-) ion].

Metallic sodium is extracted by the electrolysis of brine (aq. NaCl). After electrolysis the electrolytic solution becomes basic in nature. Write the possible electrode reactions.

Answer»

Brine is a solution of sodium chloride (molten state): The process of electrolysis involves using an electric current to bring about a chemical change and make new chemicals. In the electrolysis of brine, sodium ions migrate to the cathode, where electrons enter the melt and are reduced to sodium metal.

Na + e → Na (at cathode)

Chloride ions migrate the other way toward the anode. They give up their electrons to the anode and are oxidised to chlorine gas.

Cl^- → \(\frac{1}{2}\)Cl₂ + e^- (at node)

Overall reaction:

2NaCl → 2Na(s) + Cl₂ (g)

For aqueous solution of NaCl:

H₂O + 2e^- → H₂↑ + 2OH^- (at cathode)
Cl^- → \(\frac{1}{2}\) Cl₂ + e^- (at anode)

Overall reaction:

NaCl (aq) + H₂O(1) → Na⁺(aq) + OH^- (aq) + H₂(g) + \(\frac{1}{2}\)Cl₂(g)

After electrolysis the electrolytic solution becomes basic in nature. [Due to formation of hydroxide (OH^-) ion].

Metallic sodium is extracted by the electrolysis of brine (aq. NaCl). After electrolysis the electrolytic solution becomes basic in nature. Write the possible electrode reactions.

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