The formation constant Kf of a complex ion is a measure of the equilibrium constant for the formation of the complex ion from the metal ion and the ligand. In this case, the complex ion is Cu NH3 4, the metal ion is Cu, and the ligand is NH. The reaction can be represented as:Cu + 4NH Cu NH3 4The given formation constant Kf is 5.6 x 10. The initial concentration of Cu is 0.02 M, and the ammonia concentration is increased by 0.008 M. We will assume that the initial concentration of ammonia is x M, so the new concentration of ammonia is x + 0.008 M.To find the new formation constant, we can use the expression for Kf:Kf = [Cu NH3 4] / [Cu][NH] However, the formation constant Kf for the complex ion Cu NH3 4 does not change with the change in concentrations of Cu and NH. The value of Kf remains constant at 5.6 x 10. The change in concentrations will affect the equilibrium concentrations of the species involved in the reaction, but the formation constant itself will not change.