What is the coordination number of the metal ion in the complex [Co(NH3)5Cl]Cl2?

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Question: What is the coordination number of the metal ion in the complex [Co(NH3)5Cl]Cl2? (2023)

Options:

Correct Answer: 6

Exam Year: 2023

Solution:

In the complex [Co(NH3)5Cl]Cl2, cobalt is surrounded by five ammonia ligands and one chloride ligand, giving it a coordination number of 6.

What is the coordination number of the metal ion in the complex [Co(NH3)5Cl]Cl2? (2023)

What is the coordination number of the metal ion in the complex [Co(NH3)5Cl]Cl2? (2023)

Step 1: Identify the metal ion in the complex. In this case, the metal ion is cobalt (Co).
Step 2: Look at the ligands attached to the metal ion. In [Co(NH3)5Cl], there are five ammonia (NH3) ligands and one chloride (Cl) ligand.
Step 3: Count the total number of ligands surrounding the metal ion. There are 5 (from NH3) + 1 (from Cl) = 6 ligands.
Step 4: The coordination number is defined as the total number of ligands attached to the metal ion. Therefore, the coordination number of cobalt in this complex is 6.

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