stability constant value β ( )

stability constant value β ( ) Fe SCN +   . . Cu NH +   . . Ag CN   . . Co NH +   . . Hg CN   . . By comparing stability constant values in the above table, we can say that among the five complexes listed, Hg CN   is most stable complex ion and Fe SCN +   is least stable. . . . Stepwise formation constants and overall formation constants When a free metal ion is in aqueous medium, it is surrounded by (coordinated with) water molecules. It is represented as [MS ]. If ligands which are stronger than water are added to this metal salt solution, coordinated water molecules are replaced by strong ligands. XII U5 Coordination XII U5 Coordination - - - - Let us consider the formation of a metal complex ML in aqueous medium.(Charge on the metal ion is ignored) complex formation may occur in single step or step by step. If ligands added to the metal ion in single step, then MS + L ML + S ⇀ ↽ β overall = ML S MS L