Nothing, really. Cu has a charge of 3+ or 2+ in its ionic form (dissolved in solution). Pb has a 2+ charge in ionic form. Because they are two positive ions, there should be little or no reaction between them. Solution Nothing, really. Cu has a charge of 3+ or 2+ in its ionic form (dissolved in solution). Pb has a 2+ charge in ionic form. Because they are two positive ions, there should be little or no reaction between them..