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Nomenclature of Coordination Compounds

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Question

Write the formula of the following complexes.
Tris (ethylene diammine) cobalt (II) sulphate

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Solution

Tris(ethylene diammine) cobalt (III) sulphate
Tris indicates three ligands of ethylene diammine which is a neutral ligand, and cobalt is the central metal with oxidation number +2
ethylene diammine $\Rightarrow C_{2} H_{8} N_{2}$

Hence, the formula is:

$[C o (C_{2} H_{8} N_{2})_{3}] S O_{4}$

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