Inertelectrodes do not react with the electrolyte or the products formed during electrolysis. They just provide a surface for ions to gain or lose electrons so they form products. Graphite (a form of carbon) and platinum are commonly used to make inert electrodes.
During electrolysis of molten lead(II) bromide, PbBr2(l):
Overall, lead forms at the negative electrode and bromine forms at the positive electrode.
Predict which products form at the anode and the cathode during the electrolysis of molten calcium chloride. Explain your answer.
Calcium will form at the cathode and chlorine will form at the anode.
This is because positive calcium ions are attracted to the negative electrode (cathode), where they gain electrons to form calcium atoms. At the same time, negative chloride ions are attracted to the positive electrode (anode). They lose electrons to form chlorine atoms, which join by covalent bonds to form chlorine molecules.
Predict which products form at each electrode during the electrolysis of molten aluminium oxide.
Aluminium will form at the negative electrode and oxygen will form at the positive electrode.