Concept explainers
(a)
Interpretation: The name of the given complex compounds 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 names of metals.
- If counter ions are present in complex compound, then cation is named first which is the name of element, whereas anion is named last which is the name of salt.
To determine: The name of the complex compound
(a)

Answer to Problem 38E
Answer
The name of complex compound
Explanation of Solution
Explanation
The complex compound is
Oxidation state of Bromine ion
Oxidation state of neutral Water
It is assumed that the oxidation state of metal ion Chromium
The given complex compound contains five water molecules and three bromine ions. Since, the overall charge on stable compound is zero. Therefore,
Therefore, the oxidation state of Chromium is
The given complex compound contains five water molecules and one bromine ion. Hence, the name of anion is pentaaquabromo. It also contains counter ion bromide salt.
Therefore, the name of the complex ion
(b)
Interpretation: The name of the given complex compounds 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 names of metals.
- If counter ions are present in complex compound, then cation is named first which is the name of element, whereas anion is named last which is the name of salt.
To determine: The name of the complex compound
(b)

Answer to Problem 38E
Answer
The name of complex ion
Explanation of Solution
Explanation
The complex compound is
Oxidation state of Cyanide
Oxidation state of Sodium
It is assumed that the oxidation state of metal ion Cobalt
The given complex compound contains three Sodium atoms (counter cation) and six Cyanide atoms. Since, the overall charge on stable compound is zero. Therefore,
Therefore, the oxidation state of Cobalt is
The given complex compound contains six Cyanide ligands. Hence, the name of anion is hexacyano. It also contains counter cation Sodium. The Latin name of Cobalt is Cobaltate.
Therefore, the name of complex ion
(c)
Interpretation: The name of the given complex compounds 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 names of metals.
- If counter ions are present in complex compound, then cation is named first which is the name of element, whereas anion is named last which is the name of salt.
Todetermine: The name of the complex compound
(c)

Answer to Problem 38E
Answer
The name of complex compound
Explanation of Solution
Explanation
The complex compound is
Oxidation state of Chlorine ion
Oxidation state of neutral ligand Ethylenediammine
Oxidation state of ligand
It is assumed that the oxidation state of metal ion Iron
The given complex compound contains two Ethylenediammine molecules, two Nitrite molecules and one Chlorine atom (counter ion). Since, the overall charge on stable compound is zero. Therefore,
Therefore, the oxidation state of Iron is
The compound contains two ligands and one counter ion.
Since, the ligand Ethylenediammine already contains ‘di’. Therefore, ‘bis’ is used in the prefix of anion instead of ‘di’. Hence, the name of anion is bis(ethylene diammine)dinitito. The compound also contains counter ion Chloride salt.
Therefore, the name of complex ion
(d)
Interpretation: The name of the given complex compounds 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 names of metals.
- If counter ions are present in complex compound, then cation is named first which is the name of element, whereas anion is named last which is the name of salt.
To determine: The name of the complex compound
(d)

Answer to Problem 38E
Answer
The name of complex ion
Explanation of Solution
Explanation
The complex compound is
Similarly, oxidation state of second platinum should be calculated according to the charge on first ion sphere
The first coordination sphere contains four Ammonia ligands and two Iodine ligands, whereas second ionsphere contains only two Iodine ligands.
The Latin name of Platinum is Platinate.
Therefore, the name of complex ion
Conclusion
In naming of the complex ion, anion is named first, whereas metal ion is named second.
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Chapter 21 Solutions
Chemistry (Instructor's)
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