Final answer:
Platinum electrodes are un-reactive, meaning they do not react during redox processes and act as inert conductors in electrochemical cells, providing or accepting electrons without undergoing a transformation.
Step-by-step explanation:
Platinum electrodes are known to be un-reactive in redox reactions. This means they do not participate in the chemical reaction but serve as a conductor for electrons. In the context of electrochemical cells, a platinum electrode does not appear in the overall electrochemical reaction, acting as an inert conductor. This allows redox processes to occur without the electrode itself undergoing any transformation. For instance, in a cell where the redox couple is in solution and cannot function as an electrode, a platinum electrode can be used to provide or accept electrons without being part of the reaction. Electrochemical cells with platinum electrodes are capable of maintaining electrical conductivity and facilitating electron transfer without being consumed or altered by the reaction.
Noble metals such as platinum are chosen for their stability and resistance to corrosion, particularly in harsh chemical environments. This characteristic makes platinum and similar metals, like gold and silver, valuable for jewelry-making due to their resilience and longevity.