Millimole of Cu+ taken = 50.0ml × 1.0×10-3mol/L = 0.050mmol
MilliMole of X- taken = 50.0ml × 9.6mol/L = 480mmol
Since the value of equilibrium constant is very large , that means almost all of Cu+ is converted into complex form .
[CuX32-] = 0.050mol/100.0mL = 5.0×10-4 M
[X-] = (480-3×5)mmol/100.0mL = 4.65 M
[Cu+] = [CuX32-]/([X]3.K) = 5.0×10-4/(1.0×109 × 4.653)
= 4.97×10-15 M
= 5.0×10-15 M.
[CuX2-] = K1.K2.[Cu+][X-]2 = 1.0×106×4.97×10-15×(4.65)2
= 2.3×10-10 M
Answer :
(a) [CuX32-] = 5.0×10-4 M
(b) [CuX2-] = 2.3×10-10 M
(c) [Cu+] = 5.0×10-15 M
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