Question

A solution is formed by mixing 50.0 mL of 14.6 M NaX with 50.0 mL of 2.7 10-3 M CuNO3. Assume that Cu(I) forms complex ions with X - as follows.
Cu+(aq) + X -(aq) equilibrium reaction arrow CuX(aq) K1 = 1.0 ✕ 102
CuX(aq) + X -(aq) equilibrium reaction arrow CuX2-(aq) K2 = 1.0 ✕ 104
CuX2-(aq) + X -(aq) equilibrium reaction arrow CuX32-(aq) K3 = 1.0 ✕ 103
The overall reaction is the following.
Cu+(aq) + 3 X -(aq) equilibrium reaction arrow CuX32-(aq) K = 1.0 ✕ 109
Calculate the following concentrations at equilibrium.
CuX3 2-
CuX2 -
CuX