Question:
Identify the IUPAC name for the coordination compound \( [Co(NH_3)_6]Cl_3 \).
Identify the IUPAC name for the coordination compound \( [Co(NH_3)_6]Cl_3 \).
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Neutral ligands such as \(NH_3\) and \(H_2O\) do not affect oxidation state calculations. Always determine the charge of the complex ion first to find the oxidation state of the metal.
Updated On: May 2, 2026
- Hexaamminecobalt(II) chloride
- Hexaamminecobalt(III) chloride
- Hexaamminecobalt(IV) chloride
- Amminecobalt(III) chloride
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The Correct Option is B
Solution and Explanation
Concept:
In coordination compounds:
• Ligands attached to the central metal atom are named first.
• Neutral ligand \(NH_3\) is called ammine.
• The prefix indicates the number of ligands (hexa = 6).
• The oxidation state of the metal is written in Roman numerals.
Step 1: Identify the ligands and their number. The complex ion is \[ [Co(NH_3)_6]^{3+} \] There are six ammonia ligands. Thus, the ligand name becomes \[ \text{hexaammine} \]
Step 2: Determine the oxidation state of cobalt. Since ammonia is a neutral ligand and there are three chloride ions outside the complex: \[ \text{Charge on complex} = +3 \] Therefore, the oxidation state of cobalt is \[ +3 \]
Step 3: Write the complete IUPAC name. Ligand name + metal name + oxidation state: \[ \text{Hexaamminecobalt(III) chloride} \]
• Ligands attached to the central metal atom are named first.
• Neutral ligand \(NH_3\) is called ammine.
• The prefix indicates the number of ligands (hexa = 6).
• The oxidation state of the metal is written in Roman numerals.
Step 1: Identify the ligands and their number. The complex ion is \[ [Co(NH_3)_6]^{3+} \] There are six ammonia ligands. Thus, the ligand name becomes \[ \text{hexaammine} \]
Step 2: Determine the oxidation state of cobalt. Since ammonia is a neutral ligand and there are three chloride ions outside the complex: \[ \text{Charge on complex} = +3 \] Therefore, the oxidation state of cobalt is \[ +3 \]
Step 3: Write the complete IUPAC name. Ligand name + metal name + oxidation state: \[ \text{Hexaamminecobalt(III) chloride} \]
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