Question

Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?

September 22, 2024

Answer

The electrolysis of a concentrated solution of sodium chloride (NaCl) is known as the chlor-alkali process because it produces two important products: chlorine gas (Cl₂) and sodium hydroxide (NaOH), which is an alkali.

During the electrolysis, when electric current passes through the solution, chloride ions are oxidized at the anode to form chlorine gas, while water is reduced at the cathode to produce hydrogen gas and hydroxide ions. The combination of sodium ions (from the salt) and hydroxide ions results in the formation of sodium hydroxide, which is an alkaline substance.

So, the name “chlor-alkali” comes from the production of chlorine and alkali (sodium hydroxide) through this process.

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