Chapter 23, Problem 23.58P

(a)

Interpretation Introduction

Interpretation:

The formulas of the given compound has to be written using its names has to be given.

Potassium tris (oxalato) chromate (III).

Concept introduction:

The set of rules for naming a coordination compound is:

1. 1. When naming a complex ion, the ligands are named before the metal ion.
2. 2. Write the names of the ligands in the following order: neutral, negative, positive.  If there are multiple ligands of the same charge type, they are named in alphabetical order.
3. 3. Multiple occurring monodentate ligands receive a prefix according to the number of occurrences: $\text{di-, tri-, tetra-, penta-, or hexa}\text{.}$  Polydentate ligands (e.g., ethylene diamine, oxalate) receive $\text{bis-, tris-, tetrakis-, etc}\text{.}$  Anions end in -ido.  This replaces the final “e” when the anion ends with “-ate” (e.g, sulfate becomes sulfato) and replaces “-ide” (cyanide becomes cyanido).
4. 4. Neutral ligands are given their usual name, with some exceptions: NH₃ becomes ammine; $H_{2}O$ becomes aqua or aquo;$CO$ becomes carbonyl;  $\text{NO}$ becomes nitrosyl.
5. 5. Write the name of the central atom/ion. If the complex is an anion, the central atom’s name will end in -ate, and its Latin name will be used if available
6. 6. If the central atom’s oxidation state needs to be specified (when it is one of several possible, or zero), write it as a Roman numeral (or 0) in parentheses.
7. 7. End with “cation” or “anion” as separate words.

Explanation of Solution

Potassium tris (oxalato) chromate (III).

The compound potassium tris (oxalato) chromate (III) has “tris (oxalato) chromate” as the complex ion and the potassium as counter ion.  According to rules, the cation should be represented before an anion.

The oxidation number of the central metal ion chromium is +3.  It is represented in brackets after metal ion.

Therefore, the formula of potassium tris (oxalato) chromate (III) is compound formula is

  $K_3\left[Cr{\left(C_{\text{2}}{\text{O}}_{\text{4}}\right)}_3\right]$

(b)

Interpretation Introduction

Interpretation:

The formulas of the given compound has to be written using its names has to be given.

Tris (ethylenediamine) cobalt (III) pentacyanoiodomanganate (II)

Concept introduction;

The set of rules for naming a coordination compound is:

1. 1. When naming a complex ion, the ligands are named before the metal ion.
2. 2. Write the names of the ligands in the following order: neutral, negative, positive.  If there are multiple ligands of the same charge type, they are named in alphabetical order.
3. 3. Multiple occurring monodentate ligands receive a prefix according to the number of occurrences: $\text{di-, tri-, tetra-, penta-, or hexa}\text{.}$  Polydentate ligands (e.g., ethylene diamine, oxalate) receive $\text{bis-, tris-, tetrakis-, etc}\text{.}$  Anions end in -ido.  This replaces the final “e” when the anion ends with “-ate” (e.g, sulfate becomes sulfato) and replaces “-ide” (cyanide becomes cyanido).
4. 4. Neutral ligands are given their usual name, with some exceptions: NH₃ becomes ammine; $H_{2}O$ becomes aqua or aquo;$CO$ becomes carbonyl; $\text{NO}$ becomes nitrosyl.
5. 5. Write the name of the central atom/ion. If the complex is an anion, the central atom’s name will end in -ate, and its Latin name will be used if available
6. 6. If the central atom’s oxidation state needs to be specified (when it is one of several possible, or zero), write it as a Roman numeral (or 0) in parentheses.
7. 7. End with “cation” or “anion” as separate words.

Explanation of Solution

Tris (ethylenediamine) cobalt (III) pentacyanoiodomanganate (II).

The compound Tris (ethylenediamine) cobalt (III) pentacyanoiodomanganate (II)

has “tris (ethylenediamine) cobalt” as one of the complex ion and another complex ion is ${\left[Mn{\left(CN\right)}_{5}I\right]}_3$ like counter ion.  According to rules, the cation should be represented before an anion.  The oxidation number of the central metal ions cobalt is +3 and Manganese is +2.

The complex represents as

  ${\left[Co{\left(en\right)}_3\right]}_4^{12+}$ ${\left[Mn{\left(CN\right)}_{5}I\right]}_3^{12-}$

Therefore, the formula of Tris (ethylenediamine) cobalt (III) pentacyanoiodomanganate (II) is compound formula is

  ${\left[Co{\left(en\right)}_3\right]}_4^{}$${\left[Mn{\left(CN\right)}_{5}I\right]}_3^{}$

(c)

Interpretation Introduction

Interpretation:

The formulas of the given compound has to be written using its names has to be given.

Diamminediaquabromochloroaluminum nitrate.

Concept introduction;

The set of rules for naming a coordination compound is:

1. 1. When naming a complex ion, the ligands are named before the metal ion.
2. 2. Write the names of the ligands in the following order: neutral, negative, positive.  If there are multiple ligands of the same charge type, they are named in alphabetical order.
3. 3. Multiple occurring monodentate ligands receive a prefix according to the number of occurrences: $\text{di-, tri-, tetra-, penta-, or hexa}\text{.}$  Polydentate ligands (e.g., ethylene diamine, oxalate) receive $\text{bis-, tris-, tetrakis-, etc}\text{.}$  Anions end in -ido.  This replaces the final “e” when the anion ends with “-ate” (e.g, sulfate becomes sulfato) and replaces “-ide” (cyanide becomes cyanido).
4. 4. Neutral ligands are given their usual name, with some exceptions: NH₃ becomes ammine; $H_{2}O$ becomes aqua or aquo;$CO$ becomes carbonyl; $\text{NO}$ becomes nitrosyl.
5. 5. Write the name of the central atom/ion. If the complex is an anion, the central atom’s name will end in -ate, and its Latin name will be used if available
6. 6. If the central atom’s oxidation state needs to be specified (when it is one of several possible, or zero), write it as a Roman numeral (or 0) in parentheses.
7. 7. End with “cation” or “anion” as separate words.

Explanation of Solution

Diamminediaquabromochloroaluminum nitrate.

The compound Diamminediaquabromochloroaluminum nitrate has “${\left[Al{\left(H_{2}O\right)}_2{(N{H}_3)}_{2}BrCl\right]}^{+}$” as the complex ion and the nitrate as counter ion.  According to rules, the cation should be represented before an anion.

The oxidation number of the central metal ion chromium is +3.  It is represented in brackets after metal ion.

Ammonia and water as a neutral ligands.

Therefore, the formula of Diamminediaquabromochloroaluminum nitrate is compound formula is

  $\left[Al{\left(H_{2}O\right)}_2{(N{H}_3)}_{2}BrCl\right]N{O}_3$