The formation constant for the bis(thiosulfato)argentate(I)ion, [Ag(S2O3)2]3-, is 2.0 × 1013, while the solubility product constant for silver iodide is 8.3 × 10-17. A 0.200 molar solution of Na2S2O3 is saturated with AgI. What is the concentration of free iodide ion in the saturated solution?Hint: Combine the formation and solubility reactions to find the overall reaction and its equilibrium constant.
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