Electrolysis of Aqueous Solutions and Purification of Copper

The video tutorial covers the principles and applications of electrolysis, including the rules for predicting products in various solutions. It explains the electrolysis of copper chloride, sodium chloride, and sodium sulfate, detailing the reactions at the cathode and anode. The tutorial also discusses the purification of copper using electrolysis, highlighting the process of converting impure copper into pure copper metal.

What is formed at the cathode during the electrolysis of copper chloride solution?

• Copper metal

• Oxygen gas

• Chlorine gas

• Hydrogen gas

In the electrolysis of sodium chloride, which ion is discharged at the cathode?

• Chloride ions

• Sodium ions

• Hydroxide ions

• Hydrogen ions

During the electrolysis of sodium sulfate, what is formed at the anode?

• Oxygen gas

• Chlorine gas

• Hydrogen gas

• Sodium metal

What happens to hydroxide ions in the electrolysis of acidified water?

• They form hydrogen gas

• They form oxygen gas and water

• They form chlorine gas

• They remain unchanged

What is the main purpose of using electrolysis in copper purification?

• To form copper ions

• To generate electricity

• To remove impurities

• To produce chlorine gas

In copper purification, what happens to the impurities from the anode?

• They form a sludge beneath the anode

• They dissolve in the solution

• They are deposited at the cathode

• They are converted to copper ions

Why is a DC power supply used in the electrolysis setup for copper purification?

• To ensure constant current

• To prevent halide ion discharge

• To increase the temperature

• To reduce energy consumption

What is the role of the electrolyte in the copper purification process?

• To conduct electricity

• To form halide ions

• To increase the mass of the anode

• To dissolve impurities

During copper purification, why does the anode lose mass?

• Copper ions are deposited

• Impurities are removed

• Electrolyte concentration decreases

• Copper metal is oxidized

What remains constant during the copper purification process?

• Mass of the anode

• Mass of the cathode

• Concentration of the electrolyte

• Amount of impurities