In the Brown Ring test, the characteristic brown coordination complex formed is . How many water molecules act as ligands within the primary coordination sphere of a single complex ion?

Question

In the Brown Ring test, the characteristic brown coordination complex formed is $[Fe(H_2O)_5NO]SO_4$. How many water molecules act as ligands within the primary coordination sphere of a single complex ion?

Prashant Kotian · Accepted Answer

Correct answer: 5. The formula of the complex responsible for the brown ring is . The primary coordination sphere is denoted by the square brackets. Inside it, there is one central iron atom coordinated to one nitrosyl () ligand and exactly 5 water () ligands.

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