Question

When Copper sulphate dissolves in the Ammonium hydroxide, one deep blue complex is formed. What is the coordination no. of copper in this complex?

Answer 1

Coordination number:

• “In a coordination complex, the number of ligands that surround the central metal ion is called the coordination number.”

Copper sulfate in Ammonium hydroxide:

• When Copper sulfate is dissolved in Ammonium hydroxide, a coordination complex is formed that gives deep blue colour.
• The complex is $\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{SO}}_4$.
• It has four ammonia ligands, so its coordination number is $4$.