The metal ion M2+ in ammonia, NH3 forms the complex ion M(NH3)62+ (Kf = 5.1x108). Calculate the M2+ concentration when the equilibrium concentrations of NH3 and M(NH3)62+ are 0.057 and 0.45 M respectively.

Question

The metal ion M2+ in ammonia, NH3 forms the complex ion M(NH3)62+ (Kf = 5.1x108).  Calculate the M2+ concentration when the equilibrium concentrations of NH3 and M(NH3)62+ are 0.057 and 0.45 M respectively.