Electrolysis of Sodium Chloride

The video tutorial explains the electrolysis of sodium chloride solution without a barrier membrane. It lists the materials used, including a lead-acid battery, water, table salt, and phenolphthalein solution. The process involves dissociation of NaCl in water, reduction at the cathode, and oxidation at the anode, leading to the formation of Javeln water. The phenolphthalein solution turns pink due to alkalinity, which fades as ClO- forms. The tutorial provides a comprehensive understanding of the chemical reactions involved in electrolysis.

What is the role of phenolphthalein in the electrolysis of sodium chloride solution?

• It indicates the pH change by turning pink.

• It acts as a catalyst.

• It prevents the formation of Cl2 gas.

• It reacts with NaCl to form a new compound.

Which material is used as the anode in the electrolysis setup?

• Copper

• Steel

• Graphite

• Aluminum

What happens to water at the cathode during electrolysis?

• It is reduced to form hydrogen gas and hydroxide ions.

• It forms sodium hydroxide.

• It is oxidized to form oxygen gas.

• It remains unchanged.

What is the final product obtained after the electrolysis of sodium chloride solution?

• Javeln water

• Sodium hydroxide

• Chlorine gas

• Hydrochloric acid

Why does the pink color fade gradually during the electrolysis process?

• Because the solution becomes acidic.

• As a result of the bleaching properties of ClO-.

• Because of the reduction of Cl- ions.

• Due to the formation of hydrogen gas.