* Cathode: In electrolytic cells, the cathode is where reduction occurs (electrons are gained). Carbon rods are often used as cathodes because they are good conductors of electricity and chemically inert. In these cases, the carbon rod would attract positively charged ions from the electrolyte and facilitate their reduction.
* Anode: In galvanic cells (batteries), the anode is where oxidation occurs (electrons are lost). Carbon rods can also be used as anodes. In this case, the carbon rod would undergo oxidation, losing electrons and releasing ions into the electrolyte.
Examples:
* Electrolysis of water: In this process, a carbon rod is used as the cathode, where hydrogen ions are reduced to hydrogen gas.
* Dry cell battery: A carbon rod acts as the anode in a dry cell battery, undergoing oxidation to release electrons.
Key takeaway: The function of a carbon rod (cathode or anode) is determined by the specific electrochemical process taking place.
