Q.Write the cell reaction and calculate $E^\circ_{cell}$ of the following electrochemical cell: $Al(s)\,|\,Al^{3+}(aq.)(1M)\,||\,Zn^{2+}(aq.)(1M)\,|\,Zn(s)$; $E^\circ_{Al} = -1.66\ V$, $E^\circ_{Zn} = -0.76\ V$

An electrochemical cell consists of two electronic conductors (metal plates or graphite rods) dipped into an electrolytic conductor, driven by a redox reaction split into an oxidation half reaction (loss of electrons) at one electrode and a reduction half reaction (gain of electrons) at the other; the overall cell reaction is their sum. The cathode is, by definition, the electrode where reduction occurs; the anode is where oxidation occurs — this definition applies regardless of cell type, though the electrical sign differs between the two. There are two fundamentally different types: an electrolytic cell uses an external DC source to force a non-spontaneous reaction (ele …