Question

In which on e of the following solutions is silver chloride the most soluble?

A) 0.0150 M NH₃

B) 0.200 M HCl

C) pure water

D) 0.750 M LiNO₃

E) 0.185 M KCl

Answer 1

Answer:

The correct answer is (A).

In the given options, we can see that B and E have the common ion Cl-.

On the other hand, C and D are similar; they have no effect on silver chloride (AgCl) ideally other than the intrinsic solubility of AgCl in water.

There is no interaction of LiNO3 with Ag+ or Cl-

But NH3 can interact and coordinate with Ag+ ions and forms a complex. Therefore, as soon as a gram of AgCl dissolves, the resulting Ag+ is stolen and forms a complex of Ag(NH3)2. This pulls out more amount of Ag+ into the solution, and simultaneously more AgCl dissolved as a result.

AgCl(s) <--> Ag+(aq) + Cl-(aq) -----(1)

Ag+(aq) + 2NH3(aq) <-->[Ag(NH3)2]+ (aq) -----(2)