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Question

Rohan wants to coat his magic stick made of carbon with copper. He takes a battery, a container filled half with copper sulphate solution, a copper plate and his magic stick. But he is confused about which terminal of the battery to connect to the copper plate and which terminal to his magic stick. What should he do?


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Solution

Electroplating:

  • Electroplating is the process of plating a metal onto the other by hydrolysis mostly to prevent corrosion of metal or for decorative purposes.
  • The process uses an electric current to reduce dissolved metal cations to develop a lean coherent metal coating on the electrode.
  • Electroplating is majorly applied to modify the surface features of an object (e.g corrosion protection, lubricity, abrasion), but the process can also be used to build thickness or make objects by electroforming.
  • In electroplating, the current is usually introduced from an external source.
  • The electroplating process uses an anode and a cathode.

Cathode: The cathode is the electrode where the electrochemical reduction reaction occurs.

Anode: The anode is the electrode where the electrochemical oxidation reaction occurs.

  • Rohan wants to coat his magic stick made of carbon with copper.
  • The copper from the solution deposits to the electrode connected to the negative terminal of the battery.
  • So, he will connect the carbon stick to the negative terminal of the battery.
  • The solution gets its copper from the electrode connected to the positive terminal of the battery.
  • So, he will connect the copper plate to the positive terminal of a battery.

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