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Chapter 23: Q78P (page 1022)

When MCl4(NH3)2is dissolved in water and treated with AgNO3, 2 mol of AgCl precipitates immediately for each mole of MCl4(NH3)2. Give the coordination number of M in the complex.

Short Answer

Expert verified

The coordination no. of the central metal ion is 4.

Step by step solution

01

Concept used – Coordination 

Coordination number is the number of ligands directly attached to a central metal ion in a coordination compound. These ligands can be ions, atoms, or molecules.

02

Elucidation of coordination number

Because 2 mol of AgCl precipitates immediately for each mol of MCl4(NH3), while writing the actual formula of this coordination compound, we have to put 2Cl- counter ions outside the brackets, which means they can easily dissolve in water:MCl2NH32Cl2

The most common coordination number is 6, but it is also not rare to see 2 and 4 as coordination numbers; so, the central metal ion in this compound has coordination number 4.

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