Copper plate is used as cathode but it isn't used as an anode, why?
Copper plates are commonly used as cathodes (negative electrodes) in various electrochemical processes. This is because copper has a lower reduction potential compared to many other metals, meaning it tends to accept electrons and undergo reduction reactions more readily. As a result, copper can effectively attract and collect the positive ions (cations) present in the solution during electrochemical reactions.
On the other hand, copper is not typically used as an anode (positive electrode) in such processes. This is because, as an anode, copper has a tendency to oxidize and dissolve into the solution, resulting in its depletion over time. In most cases, other metals or materials are chosen as anodes based on their properties. For example, in many common setups, metals like zinc or graphite are preferred as anodes due to their higher oxidation potential and greater stability during the electrochemical reactions.
To determine which materials are suitable for cathodes and anodes in specific electrochemical processes, the reduction potential of different metals or materials needs to be considered. The Standard Electrode Potentials table, often available in chemistry or electrochemistry references, provides a list of these values. By comparing the reduction potentials of various materials, you can predict their behavior as cathodes or anodes.