The standard cell potential of the cell shown in the following diagram is +0.22 V. Ni | Ni(NO:)2(aq) ||KI(aq)| Hg2l2(s) | Hg() | Pt (i) Formulate half-reactions and write a balanced equation for the overall cell reaction. (ii) Give a sketch of the cell, indicating directions of ionic and electronic flows when the terminals are connected by a metal wire. (iii) Making use the Debye-Hckel limiting law, - log y, = 0.509| z,z |V, and the Nernst equation, estimate the potential of the cell if the concentration of the electrolytes in the anode and cathode are 0.01 and 0.05 mol dm3, respectively.