suppose a cobalt atom in the +3 oxidation state formed a complex with two bromid

Question

suppose a cobalt atom in the +3 oxidation state formed a complex with two bromide (Br-) anions and four ammonia (NH3) molecules. write the chemical formula of this complex. suppose a cobalt atom in the +3 oxidation state formed a complex with two bromide (Br-) anions and four ammonia (NH3) molecules. write the chemical formula of this complex. suppose a cobalt atom in the +3 oxidation state formed a complex with two bromide (Br-) anions and four ammonia (NH3) molecules. write the chemical formula of this complex.

Explanation / Answer

The ligands will be arranged in alphabetical order in the coordination sphere and then a net charge of +1 will be given to the coordination entity so that the oxidation number of Cobalt becomes +3

The formula of this compound will be

[Co(NH3)4(Br)2]+1

Ammine group has charge 0 and bromine anion has a charge of -1

So the oxidation number of central metal cobalt will be ,

Co + (4 x0) + (2 x -1) = +1

Co = +3

The name of this ion wiill be

tetraaminedibromocobalt (III)

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