In experiment 1, a cyclic voltammogram at an HMDE was obtained from a 0.167-mM solution of Pb2+ at a scan rate of 2.5 Vis. In experiment 2, a second CV is to be obtained from a 4.38-mM solution of Cd2+ using the same HMOE. What must the scan rate be in experiment 2 to record the same peak current in both experiments if the diffusion coefficients of Cd2 and Pb2+ are 0.72 X 10-5 cm2 s-1 and 0.98 cm2 s-1, respectively. Assume that the reductions of both cations are reversible at the HMDE.