
Concept explainers
(a)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Ru(NH3)5Cl]2+
(a)

Answer to Problem 34E
Answer
The name of complex ion [Ru(NH3)5Cl]2+ is pentaamminechlororuthenium(III).
Explanation of Solution
Explanation
The complex ion is [Ru(NH3)5Cl]2+. This ion contains positive charge.
Oxidation state of Chlorine (Cl−) is −1.
Oxidation state of Ammonia (NH3) is 0.
It is assumed that the oxidation state of metal ion Ruthenium (Ru) is x.
The given complex compound contains five Ammonia ions and a Chlorine ion. Since, the overall charge on complex ion is +2. Therefore,
5(0)+1(−1)+x=+2x=+3
Therefore, the oxidation state of ruthenium is +3.
The given complex compound contains five Ammonia ions and a Chlorine ion. Hence, the name of anion is pentaamminechloro.
Therefore, the name of complex ion [Ru(NH3)5Cl]2+ is pentaamminechlororuthenium(III).
(b)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Fe(CN)6]4−
(b)

Answer to Problem 34E
Answer
The name of complex ion [Fe(CN)6]4− is hexacyanoferrate(II).
Explanation of Solution
Explanation
The complex ion is [Fe(CN)6]4−. This ion contains negative charge.
Oxidation state of Cyanide (CN−) ligand is −1.
It is assumed that the oxidation state of iron (Fe) is x.
The given complex compound contains six Cyanide ions and one Iron ion. Since, the overall charge on complex ion is −4. Therefore,
6(−1)+x=−4x=+2
Therefore, the oxidation state of Iron is +2.
The given complex compound contains six Cyanide ions. Hence, the name of anion is hexacyano. The Latin name of Iron is Ferrate.
Therefore, the name of complex ion [Fe(CN)6]4− is hexacyanoferrate(II).
(c)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Mn(NH2CH2CH2NH2)3]2+
(c)

Answer to Problem 34E
Answer
The name of complex ion [Mn(NH2CH2CH2NH2)3]2+ is triethylenediaminemanganate(II).
Explanation of Solution
Explanation
The complex ion is [Mn(NH2CH2CH2NH2)3]2+. This ion contains positive charge.
Oxidation state of neutral Ethylenediamine (NH2CH2CH2NH2) ligand is 0.
It is assumed that the oxidation state of Manganese (Mn) is x.
The given complex compound contains three ethylenediamine ions and one Manganese ion. Since, the overall charge on complex ion is +2. Therefore,
3(0)+x=+2x=+2
Therefore, the oxidation state of Manganese is +2.
The given complex compound contains three Ethylenediamine ions. Hence, the name of anion is triethylenediamine. The Latin name of Manganese is Manganate.
Therefore, the name of complex ion [Mn(NH2CH2CH2NH2)3]2+ is triethylenediaminemanganate(II).
(d)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Co(NH3)5NO2]2+
(d)

Answer to Problem 34E
Answer
The name of complex ion [Co(NH3)5NO2]2+ is pentaamminenitrocobalt(III).
Explanation of Solution
Explanation
The complex ion is [Co(NH3)5NO2]2+. This ion contains positive charge.
Oxidation state of Nitrite (NO2−) is −1.
Oxidation state of neutral Ammonia (NH3) is 0.
It is assumed that the oxidation state of metal ion Cobalt (Co) is x.
The given complex compound contains five Ammonia ions and one Nitrite ion. Since, the overall charge on complex ion is +2. Therefore,
5(0)+1(−1)+x=+2x=+3
Therefore, the oxidation state of Cobalt is +3.
The given complex compound contains five Ammonia ions and one Nitrite ion. Hence, the name of anion is pentaamminenitro.
Therefore, the name of complex ion [Co(NH3)5NO2]2+ is pentaamminenitrocobalt(III).
(e)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Ni(CN)4]2−
(e)

Answer to Problem 34E
Answer
The name of complex ion [Ni(CN)4]2− is tetracyanonickelate(II).
Explanation of Solution
Explanation
The complex ion is [Ni(CN)4]2−. This ion contains negative charge.
Oxidation state of cyanide (CN−) ligand is −1.
It is assumed that the oxidation state of metal ion Nickel (Ni) is x.
The given complex compound contains four Cyanide ions and one Nickel ion. Since, the overall charge on complex ion is −2. Therefore,
4(−1)+x=−2x=+2
Therefore, the oxidation state of Nickel is +2.
The given complex compound contains four Cyanide ions. Hence, the name of anion is tetracyano. The Latin name of Nickel is Nickelate.
Therefore, the name of complex ion [Ni(CN)4]2− is tetracyanonickelate(II).
(f)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Cr(NH3)4(Cl)2]+.
(f)

Answer to Problem 34E
Answer
The name of complex ion [Cr(NH3)4(Cl)2]+ is tetraamminedichlorochromium(III).
Explanation of Solution
Explanation
The name of complex ion [Cr(NH3)4(Cl)2]+ is tetraamminedichlorochromium(III).
Oxidation state of Chlorine (Cl−) is −1.
Oxidation state of neutral Ammonia (NH3) is 0.
It is assumed that the oxidation state of metal ion Chromium (Cr) is x.
The given complex compound contains four Ammonia ions and two Chlorine ions. Since, the overall charge on complex ion is +1. Therefore,
4(0)+2(−1)+x=+1x=+3
Therefore, the oxidation state of Chromium is +3.
The given complex compound contains four Ammonia ions and two Chlorine ions. Hence, the name of anion is tetraamminedichloro.
Therefore, the name of complex ion [Cr(NH3)4(Cl)2]+ is tetraamminedichlorochromium(III).
(g)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Fe(C2O4)3]3−
(g)

Answer to Problem 34E
Answer
The name of complex ion [Fe(C2O4)3]3− is trioxalateferrate(III).
Explanation of Solution
Explanation
The complex ion is [Fe(C2O4)3]3−. This ion contains negative charge.
Oxidation state of Oxalate (C2O42−) ligand is −2.
It is assumed that the oxidation state of Iron (Fe) is x.
The given complex compound contains three Oxalate ions and one Iron ion. Since, the overall charge on complex ion is −3. Therefore,
3(−2)+x=−3x=+3
Therefore, the oxidation state of iron is +3.
The given complex compound contains three Oxalate ions. Hence, the name of anion is trioxalate. The Latin name of Iron is Ferrate.
Therefore, the name of complex ion [Fe(C2O4)3]3− is trioxalateferrate(III).
(h)
Interpretation: The name of the given complex ions is to be stated.
Concept introduction: Rules followed in the naming of coordination compound:
- In the naming of coordination compound, the name of anion (ligand) comes first. Metal ion is named second, which is the name of element.
- An ‘o’ is added to the root name of anion.
- Greek prefix is used to express the number of ligands.
- Roman numeral is used to denote the oxidation state of metal ion.
- In case of more than one type of ligand present in a compound, they are named alphabetically.
- The suffix ‘-ate’ is added to metal ion if complex ion contains negative charge. Latin names are also used to identify the name of metals.
To determine: The name of the complex ion [Co(SCN)2(H2O)4]+
(h)

Answer to Problem 34E
Answer
The name of complex ion [Co(SCN)2(H2O)4]+ is tetraaquadithiocyanatocobalt(III).
Explanation of Solution
Explanation
The complex ion is [Co(SCN)2(H2O)4]+. This ion contains positive charge.
Oxidation state of Thiocyanate (SCN−) is −1.
Oxidation state of neutral Water (H2O) is 0.
It is assumed that the oxidation state of metal ion cobalt (Co) is x.
The given complex compound contains two Thiocyanate ions and four Water ions. Since, the overall charge on complex ion is +1. Therefore,
4(0)+2(−1)+x=+1x=+3
Therefore, the oxidation state of cobalt is +3.
The given complex compound contains two Thiocyanate ions and four Water ions. Hence, the name of anion is tetraaquadithiocyanato.
Therefore, the name of complex ion [Co(SCN)2(H2O)4]+ is tetraaquadithiocyanatocobalt(III).
Conclusion
In the naming complex ion, anion is named first, whereas metal ion is named second.
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Chapter 21 Solutions
Chemistry
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