- #1
terryds
- 392
- 13
Why Na+ (which is positive in charge) migrate to the cathode which is also positive in charge??
They should repel each other right?
symbolipoint said:THE CATHODE SUPPLIES NEGATIVE CHARGE. IT IS NOT POSITIVE.
The charge of the cathode is different in electrolytic cells and galvanic cells. The cathode is defined to be the electrode where reduction takes place.psychoticcr7 said:Cathode is negatively charged. It's called cathode because cations migrate there.
A common misconception about electrolysis is that "ions are attracted to the oppositely-charged electrode." This is true only in the very thin interfacial region near the electrode surface. Ionic motion throughout the bulk of the solution occurs mostly by diffusion, which is the transport of molecules in response to a concentration gradient. Migration— the motion of a charged particle due to an applied electric field, is only a minor player, producing only about one non-random jump out of around 100,000 random ones for a 1 volt cm–1 electric field. Only those ions that are near the interfacial region are likely to undergo migration.
Merlin3189 said:Because H and OH entities are ubiquitous in aqueous solutions, might an H+ or OH- move virtually by transfer of charge and be therefore hyper-mobile compared to other ions?
Can you share a reference that supports your claim as it applies to Galvanic Process?psychoticcr7 said:Cathode is negatively charged. It's called cathode because cations migrate there.
Cations have a positive charge and are attracted to the negative charge of the cathode. This is due to the principle of electrostatic attraction, where opposite charges attract each other.
The principle behind cation migration is based on the movement of charged particles in an electric field. Cations, which have a positive charge, are drawn toward the cathode, which has a negative charge.
The presence of an electric field causes cations to experience a force that pulls them towards the cathode. This force is proportional to the strength of the electric field and the charge of the cations.
Yes, the rate of cation migration can be influenced by factors such as the strength of the electric field, the charge of the cations, and the medium in which the migration is occurring. Higher electric fields and higher charge on the cations can result in faster migration.
Yes, cations can migrate towards any electrode with a negative charge, not just the cathode. However, the cathode is the most common destination for cation migration, as it typically has a larger negative charge compared to other electrodes.