Electrolytes are ionic compounds that are either:
Under these conditions, the ions in electrolytes are free to move within the liquid.
Electrolysis is a process in which electrical energy, from a direct current (dc) supply, decomposes (breaks down) electrolytes. The free ions in electrolytes are attracted to the oppositely-charged electrodes connected to the dc supply.
Molten lead bromide, PbBr2(l), is an electrolyte. During electrolysis:
So lead forms at the negative electrode and bromine forms at the positive electrode.
Predict the products of electrolysis of molten calcium chloride.
Calcium will form at the negative electrode because metals form there from positively charged metal ions. Chlorine will form at the positive electrode because non-metals form there from negatively charged non-metal ions.
Predict the products of electrolysis of molten aluminium oxide.
Aluminium will form at the negative electrode and oxygen will form at the positive electrode.