The reaction chemistry of aqueous copper(II) ions with ammonia is commonly used in both general chemistry and inorganic chemistry texts to illustrate the equilibria of complex ions in solution.  Although the system initially seems simple, further analysis of the chemical species involved shows that it is in fact quite complicated.  First of all, ammonia is a weak base and its basic equilibrium reaction must be taken into account.  Second, although the aquated copper(II) ion is the most prevalent ion in solution before ammonia is added, this species is itself a weak acid.  Third, a series of