How many ions per mole of the following complexes are present in their solution?
$C u_{2} [F e (C N)_{6}]$

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Solution

The component in the square brackets is a singular mega unit of atoms i.e complex ion. All ions mentioned outside the square brackets are other ions, ionizable in polar solvents.

In the case of $C u_{2} [F e (C N)_{6}]$ , it is ionizable completely into $t w o C u^{2 +}$ and one $[F e (C N)_{6}]^{4 -}$ ions. Thus, $three$ moles ion per mole of these complexes are present in their solution.

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