A student prepared a cobalt complex that has one of the following structures: [Co(NH₃)6]Cl₃, [Co(NH₃)5Cl]Cl₂, or [Co(NH₃)4Cl₂]Cl. Explain how the student would distinguish among these possibilities by an electrical conductance experiment. At the student's disposal are three strong electrolytes: NaCl, MgCl₂, and FeCl₃, which may be used for comparison purposes.
