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:
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)
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