What is the molar solubility of Fe(OH) ₃ (s) in a solution that is buffered at pH 3.50 at 25°C? The Ksp of Fe(OH)₃ is 6.3 x 10^–38 at 25°C.

• A. 1.99x10^-27 M
• B. 1.99x10^-34 M
• C. 6.64x10^-28 M
• D. 1.99x10^-6 M
• E. 1.25x10^-9 M