Consider the Reactions of Cadmium with the Thiosulfate Anion

Multiple Choice

Consider the reactions of cadmium with the thiosulfate anion. Cd²⁺(aq) + S₂O₃²⁻(aq) ⇄ Cd(S₂O₃) (aq) K₁ = 8.3 × 10³
Cd(S₂O₃) (aq) + S₂O₃²⁻(aq) ⇄ Cd(S₂O₃) ₂²⁻(aq) K₂ = 2.5 × 10²
What is the value for the equilibrium constant for the following reaction?
Cd²⁺(aq) + 2S₂O₃²⁻(aq) ⇄ Cd(S₂O₃) ₂²⁻(aq)

A) 0.030
B) 33
C) 8.1 × 10 ³
D) 8.6 × 10 ³
E) 2.1 × 10 ⁶