A student connects a Cd2+ (0.20 M)|Cd(s) half cell to a Cu2+(1M)|Cu(s) electrode. When the red lead is attached to the Cu electrode, the cell potential read by the voltmeter (Ecell) is +0.77 V.
a. What is the reduction half-reaction at the cathode (red lead)?
b. What is the oxidation half-reaction at the anode (black lead)?
c. What is the overall cell reaction?