Solubility and Complex Ions
Formation of complex ions can also increase solubility.
Can dissolve AgCl with NH3.
AgCl(s) ? Ag+(aq) + Cl-(aq)
Ksp = [Ag+][Cl-] = 1.70 x 10-10
Ag+(aq) + 2NH3(aq) ? Ag(NH3)2+(aq)
Kf = [Ag(NH3)2+]/[Ag+][NH3]2
Mixture of AgCl and AgBr can be separated: 5 M NH3 dissolves AgCl, but not AgBr.