Chapter 20, Problem 48QRT

(a)

Interpretation Introduction

Interpretation:

Ligands present in the coordination compounds ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$ and ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$ has to be identified.

Explanation of Solution

Ligands present in complex ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$:

In this complex, the counter ion is three ${\text{Na}}^{\text{+}}$ ions.  Complex ion is ${{\text{[IrCl}}_{\text{6}}\text{]}}^{\text{3-}}$ ions.  In the complex ion, there are six chloride ions.  These six chloride ions are coordinated to the central metal atom.  Therefore, the ligands present in ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$ is ${\text{Cl}}^{-}$.

Ligands present in complex ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$:

In this complex, the counter ion is two ${\text{Br}}^{-}$ ions.  Complex ion is ${{\text{[Mo(CO)}}_{\text{4}}\text{]}}^{\text{2+}}$ ions.  In the complex ion, there are four carbon monoxide molecule.  These four carbon monoxide molecule are coordinated to the central metal atom.  Therefore, the ligands present in ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$ is $\text{CO}$.

(b)

Interpretation Introduction

Interpretation:

Central metal atom and its charge in the coordination compounds ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$ and ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$ has to be identified.

Explanation of Solution

Central metal atom present in complex ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$:

In this complex, the counter ion is three ${\text{Na}}^{\text{+}}$ ions.  Complex ion is ${{\text{[IrCl}}_{\text{6}}\text{]}}^{\text{3-}}$ ions.  In the complex ion, there are six chloride ions.  These six chloride ions are coordinated to the central metal atom.  The central metal atom is iridium.  As the overall charge on the complex ion is $3-$ and each chloride ion possess $-1$ charge on it, the charge on the central metal atom is found to be $3+$.  The central metal atom and its charge can be given as ${\text{Ir}}^{3+}$.

Central metal atom present in complex ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$:

In this complex, the counter ion is two ${\text{Br}}^{-}$ ions.  Complex ion is ${{\text{[Mo(CO)}}_{\text{4}}\text{]}}^{\text{2+}}$ ions.  In the complex ion, there are four carbon monoxide molecule.  These four carbon monoxide molecule are coordinated to the central metal atom.  As carbon monoxide are neutral ligand, in order to maintain neutrality of the complex, the charge carried by the central metal atom will be opposite to that of the counter ion.  The central atom is found to have a charge of $+2$.  The central metal atom and its charge can be given as ${\text{Mo}}^{\text{2+}}$.

(c)

Interpretation Introduction

Interpretation:

Formula and charge of the complex ion in the coordination compounds ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$ and ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$ has to be identified.

Explanation of Solution

Formula and charge of the complex ion in ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$:

In this complex, the counter ion is three ${\text{Na}}^{\text{+}}$ ions.  As there are $3+$ charge on the counter ion, the complex ion has to possess $3-$ charge in order to make the complex neutral.  The formula and charge on the complex ion is ${{\text{[IrCl}}_{\text{6}}\text{]}}^{\text{3-}}$.

Formula and charge of the complex ion in ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$:

In this complex, the counter ion is two ${\text{Br}}^{-}$ ions.  Therefore, the complex ion should have $2+$ charge in order to make the coordination complex neutral.  The formula and charge on the complex ion is ${{\text{[Mo(CO)}}_{\text{4}}\text{]}}^{\text{2+}}$.

(d)

Interpretation Introduction

Interpretation:

Ions that are not part of complex ion in the complexes ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$ and ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$ has to be identified.

Explanation of Solution

Ions that are not part of complex ion in ${\text{Na}}_{\text{3}}{\text{[IrCl}}_{\text{6}}\text{]}$:

Complex ion in the given complex is ${{\text{[IrCl}}_{\text{6}}\text{]}}^{\text{3-}}$ ion.  Apart from the complex ion, there are counter ions present in order to make the coordination complex neutral.  The ions that are present apart from complex ion are three ${\text{Na}}^{\text{+}}$ ions.

Ions that are not part of complex ion in ${\text{[Mo(CO)}}_{\text{4}}{\text{]Br}}_{\text{2}}$:

Complex ion in the given complex is ${{\text{[Mo(CO)}}_{\text{4}}\text{]}}^{\text{2+}}$ ion.  Apart from the complex ion, there are counter ions present in order to make the coordination complex neutral.  The ions that are present apart from complex ion are two ${\text{Br}}^{-}$ ions.