Chapter 15.12, Problem 15.28P

Silver bromide dissolves in aqueous sodium thiosulfate, Na₂S₂O₃, yielding the complex ion Ag(S₂O₃)₂^3–:

     $\text{AgBr}\left(s\right)+2{\text{S}}_{\text{2}}{\text{O}}_{\text{3}}{}^{2-}\left(aq\right)\rightleftharpoons \text{Ag}{\left({\text{S}}_{\text{2}}{\text{O}}_{\text{3}}\right)}_2{}^{3-}\left(aq\right)+{\text{Br}}^{-}\left(aq\right)K=?$

Calculate the equilibrium constant K for the dissolution reaction, and calculate the molar solubility of AgBr in 0.10 M Na₂S₂O₃. K_sp = 5.4 × 10^–13 for AgBr and K_f = 4.7 × 10¹³ for Ag(S₂O₃)₂^3–.