Question

Question: Correct each name that has an error:

(a) $\mathbf{Na}\mathbf{\left[}{\mathbf{FeBr}}_{\mathbf{4}}\mathbf{\right]}$sodium tetrabromoferrate(II)

(b) ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{\mathbf{2}\mathbf{-}}$nickel hexaammine ion

(c) $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{I}_3\right]$triamminetriiodocobalt(III)

(d) ${\left[V{\left(\mathrm{CN}\right)}_6\right]}^{\mathbf{3}\mathbf{-}}$hexacyanovanadium(III) ion

(e) $\mathbf{K}\left[{\mathrm{FeCl}}_4\right]$potassium tetrachloroiron(III)

Short answer

(a) Correct name for $\mathrm{Na}\left[{\mathrm{FeBr}}_4\right]$sodium tetrabromoferrate(II) is sodium tetrabromoferrate (III)

(b) Correct name for ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2-}$nickel hexaammine ion is hexaamminenickel (II) ion

(c) The IUPAC name provided for $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\mathrm{I}}_3\right]$triamminetriiodocobalt(III) is correct.

(d) Correct name for ${\left[\mathrm{V}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$hexacyanovanadium(III) ion is hexacyanovanadate (III) ion

(e) Correct name for $\mathrm{K}\left[{\mathrm{FeCl}}_4\right]$potassium tetrachloroiron(III) is potassium tetrachloroferrate (III)

Step-by-step solution

Given Data

Five compounds are given.

IUPAC name of the complex compound

To name the complex compounds, specific rules are designed:

1. The ligands in the coordination sphere should be called in alphabetical order.
2. If the coordination sphere has a negative charge, the -ate suffix should come.
3. The oxidation state of the central metal atom should be represented with roman letters.

(a)

For $\mathrm{Na}\left[{\mathrm{FeBr}}_4\right]$given name is sodium tetrabromoferrate(II)

The overall charge of$\left[{\mathrm{FeBr}}_4\right]$is 1-, and since the charge of each Br is 1- and thus the charge on Fe should be 3+.

Therefore the correct IUPAC name is sodium tetrabromoferrate (III).

(b)

For ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2-}$the given IUPAC name is nickel hexaammine ion

The charge on the Ni ion is 2+, since the charge on the ammonia molecule will be 0.

Ligand must appear before the ion.

Thus the corrected IUPAC name is hexaamminenickel (II) ion.

(c)

For$\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_3{\mathrm{I}}_3\right]$, the given name is triamminetriiodocobalt(III).

Solution: The name is provided correctly, with the ligands alphabetized, and the ion charge indicated at the end of the complex compound.

(d)

For ${\left[\mathrm{V}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$, the given name is hexacyanovanadium (III) ion.

The overall charge of the ion is negative; therefore, the name of the metal ion must end in -ate

Thus the correct IUPAC name is hexacyanovanadate (III) ion.

(e)

For $\mathrm{K}\left[{\mathrm{FeCl}}_4\right]$the given name is potassium tetrachloroiron (III)

The charge of the metal ion is correct, and the suffixes and ligand are also named properly. However, convention states that the metal ion must be named in its Latin version, therefore forum must be used. Given that the complex ion has an overall negative charge, the name must be ferrate

Thus the corrected IUPAC name is potassium tetrachloroferrate (III).