Question

A 0.10-mol sample of AgNO₃ is dissolved in 1.00 L of 1.00 M NH₃. If 0.010 mol of NaCl is added to this solution, will AgCl (K_sp = 1.8 x 10^–10) precipitate? (Ag⁺ and NH₃ form the complex ion [Ag(NH₃)₂] ⁺ with K_f = 1.6 x 10⁷ )

Answer 1

To determine if a precipitate forms, we need to determine the concentration of Ag+ in the solution, and then calculate Q_sp to determine if a precipitate forms.

To determine the concentration of Ag⁺ , due to the large K_f value, assume all of the Ag⁺ reacts to form the complex and then some dissociates back.

AgCl will NOT precipitate