Electrolysis of Copper Solutions

The video explains how copper is purified using electrolysis. Copper extracted from ore is not pure enough for electrical use, so electrolysis is used to purify it. The process involves a copper sulfate solution, a pure copper cathode, and an impure copper anode. Copper ions move between the anode and cathode, depositing pure copper at the cathode and dissolving impure copper at the anode. Anode sludge, containing valuable metals, forms as a byproduct. The video also discusses the electrochemical series and the need to manage solution concentration.

Why is copper not directly used as an electrical conductor after extraction?

• It is too reactive.

• It is too heavy.

• It is not pure enough.

• It is too expensive.

What is the role of copper sulfate in the electrolysis process?

• It acts as a catalyst.

• It provides copper ions for the reaction.

• It prevents oxidation.

• It increases the temperature.

Where is the pure copper sheet placed in the electrolysis setup?

• Outside the solution

• At the cathode

• In the middle

• At the anode

What happens to copper ions at the cathode during electrolysis?

• They evaporate.

• They form copper oxide.

• They dissolve into the solution.

• They are deposited as copper metal.

What is observed at the anode during the electrolysis process?

• The anode remains unchanged.

• The anode increases in size.

• The anode gradually disappears.

• The anode changes color.

Why might industries retain the anode sludge?

• It is hazardous waste.

• It contains valuable metals.

• It can be reused as an anode.

• It is required for the reaction.

Which metals are likely to be found in the anode sludge?

• Iron and nickel

• Lead and mercury

• Silver and gold

• Aluminum and tin

What happens if the concentration of zinc ions becomes too high in the solution?

• The solution becomes acidic.

• The electrolysis process speeds up.

• The anode dissolves completely.

• The copper sulfate solution needs replacement.

What is the main purpose of passing a direct current through the electrolysis cell?

• To prevent corrosion

• To cool the system

• To initiate the chemical reactions

• To heat the solution

What is the overall result of the electrolysis process on the copper sheets?

• Both sheets dissolve completely.

• Both sheets increase in size.

• The pure sheet grows, and the impure sheet shrinks.

• The impure sheet grows, and the pure sheet shrinks.