A student has a solution containing a mixture of metal cations: Cu+2, Cr+2, and Fe+3, each a solution with NO3-anion. Adding a concentrated solution of NH4OH(aq) caused the precipitation of Cr+2and Fe+3as insoluble hydroxides. The Cu+2remained in solution and forms the complex ion Cu(NH3)4+2. Find all the balanced molecular equations, total ionic equations, and net ionic equations that represent each of these reactions.