What is the molar solubility of AgCl in pure water and in 0.20 M Na₂S₂O₃ solution? Use the following values: K_sp AgCl = 1.8×10^–10 and K_f [Ag(S₂O₃)₂]^3– = 4.7×10¹³.

• A. In pure water: 1.3×10^–5 M
  In 0.20 M Na₂S₂O₃ solution: 0.10 M
• B. In pure water: 1.3×10^–5 M
  In 0.20 M Na₂S₂O₃ solution: 10 M
• C. In pure water: 5.6×10^–4 M
  In 0.20 M Na₂S₂O₃ solution: 0.10 M
• D. In pure water: 5.6×10^–4 M
  In 0.20 M Na₂S₂O₃ solution: 10 M

Answer: (A)