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  Coordination sphere

Coordination sphere:

In complex compound, it generally, central metal ion and the ligands are enclosed within square bracket and termed as coordination sphere. This symbolizes a single constituent unit. The ionisable species are located outside the square bracket.

[M(L)n](n-) (or) (n+)
[Fe(CN)6]4-,  [Cu(NH3)4]2+

Such ions do not ionise to provide the test for constituent ions.

Coordination number:

The coordination number of a metal ion in complex can be stated as the number of ligand donor atoms to which the metal is directly bonded. Numerically coordination number symbolizes the total number of the chemical bonds formed among the central metal ion and the donor atoms of the ligands. For illustration in K4[Fe(CN)6] the coordination number of Fe(II) is 6 and in [Cu(NH3)4]SO4 the coordination number of  Cu(II)  is 4.

Charge on the complex ion:

Charge on the complex ion is equivalent to the sum of the charges on the metal ion and their ligands.

 

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