7. The formation constant (K) for Cu(NH 3) 4^2+ is 5 * 10 ^ 13 A) Write the balanced reaction. Cu ^2 + (a 9 ) + 4NH 3 (a 9 ) Cu(NH 3 ) 4 (aq); Kf = [Cv(NH 3) 4 [Cv^ 24 ] Cnv b) Using the reaction and K_{f} the limiting reagent approximation for large equilibrium constants, solve the following problem. If 0.20 mole CuSO 4 is added to a liter of 1.20M N*H_{3} solution what is the concentration of ions Cu^ * + + 4NH 3; C 0 (NH 3 ) 4^2+ at equilibrium.