Why Agcl is soluble in NH3

Asked by Balaraman Saptharishi | 11th Aug, 2012, 05:58: PM

Expert Answer:

AgCl is an insoluble or sparingly soluble salt. The following equilibium exists when AgCl is added in to water:
AgCl(s) <--> Ag+(aq) + Cl-(aq) --(1)
Since AgCl is insoluble, the equilibrium lies to the left.

In aq NH3, :NH3 acts as a ligand and forms a complex with Ag+ :
Ag+(aq) + 2NH3(aq) <-->[Ag(NH3)2]+ (aq) --(2)

Reaction(2) lowers the concentration of Ag+ and shifts the equilibrium of (1) to the left, dissolving AgCl.

Answered by  | 11th Aug, 2012, 08:44: PM

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