In the complex compound \((\text{NH}_4)_2[\text{Fe}(\text{H}_2\text{O})_2\text{Cl}_4]\), the central metal ion is iron (Fe), and it is being coordinated by two water molecules (\(\text{H}_2\text{O}\)) and four chloride ions (\(\text{Cl}^-\)).
To determine the coordination number, we need to count the number of ligands that are directly bonded to the central metal ion (Fe). In this case:
- There are 2 water molecules contributing 2 coordination sites.
- There are 4 chloride ions contributing 4 coordination sites.
Therefore, the total coordination number is: \[ 2 (\text{from } \text{H}_2\text{O}) + 4 (\text{from } \text{Cl}^-) = 6 \]
The coordination number of this complex is 6.
In terms of geometry, a coordination number of 6 typically results in an octahedral geometry. Thus, the geometry of the complex \((\text{NH}_4)_2[\text{Fe}(\text{H}_2\text{O})_2\text{Cl}_4]\) is octahedral.
Summary:
- Coordination number: 6
- Geometry: Octahedral