A solution is initially 2.5 ? 10-3 M in Cu+ and 2.5 ? 10-3 in Pb 2+. Iodine ion is gradually added to the solution. Determine the concentrations of Cu+, Pb +2, and I- at the point of maximum separation. The solubility products of CuI and PbI2 are 5.3 ? 10-12 and 7.9 ? 10-9, respectively.