8. Consider the following standard reduction (half-cell) potentials: Al3+(aq) + 3e + Al(s); E = -1.66 V Cu2+(aq) + 2e Cu(s); E = +0.34 V (a) Sketch a voltaic cell consisting of the above half-cells using KNO3 as salt-bridge. Label the following: (i) the anode and cathode half-cells; (ii) the positive and negative electrodes; (iii) the direction electron flows in the circuit and ions flow in the salt bridge. (b) Write the net equation for the overall cell reaction and calculate the standard cell potential (Ecell) at 25C. (c) Calculate AG for the overall reaction at 25C. Is the cell spontaneous or not