Question

Name the following complex ions:

Short answer

1. Hexa-cyanidomanganate(II)
2. Cis-tetraamminedichlorocobalt(III)
3. Penta-amminechlorocobalt(II)

Nomenclature of positive and negative charged complex respectively.

Step-by-step solution

a) Identification of overall charge of the complex

The given complex has negative charge.

Determining the oxidation state of central metal atom:

Cyanide is an anionic ligand with -1 charge

$\begin{array}{l}\mathrm{X}+6\times (-1)=-4\\ \mathrm{X}=+2\end{array}$

Naming of the given complex: Hexa-cyanidomanganate(II)

b) Identification of overall charge of the complex

The given complex has positive charge.

Determining the oxidation state of central metal atom:

Ammine is neutral and chlorine is an anionic ligand with -1 charge

$\begin{array}{l}X+4\times \left(0\right)+2\times (-1)=+1\\ X=+3\end{array}$

Naming of the given complex: Cis-tetraamminedichlorocobalt(III)

c) Identification of overall charge of the complex

The given complex has positive charge.

Determining the oxidation state of central metal atom:

Ammine is neutral and chlorine is an anionic ligand with -1 charge

$\begin{array}{l}X+5\times \left(0\right)+1\times (-1)=+1\\ X=+2\end{array}$

Naming of the given complex: Pentaamminechlorocobalt(II)