[CO(SO4)(NH3)5]+  [ENDORSED]

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Cristian Carrasco 1F
Posts: 52
Joined: Fri Sep 29, 2017 7:06 am


Postby Cristian Carrasco 1F » Wed Nov 29, 2017 5:05 pm

can someone explain why cobalt has an oxidation number of three in this coordination compound??

Eryn Wilkinson 3H
Posts: 20
Joined: Fri Sep 29, 2017 7:07 am

Re: [CO(SO4)(NH3)5]+

Postby Eryn Wilkinson 3H » Wed Nov 29, 2017 5:51 pm

SO4 has a charge of -2 automatically and NH3 has no charge. Since there is an overall charge of +1, Co must be +3, because it cancels out the -2 charge of SO4 and has a net charge of +1 left over.

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Re: [CO(SO4)(NH3)5]+  [ENDORSED]

Postby Chem_Mod » Wed Nov 29, 2017 5:51 pm

You must compare the unknown cobalt to the known charges of the ligands while also considering the total charge of the complex. Here, NH3 is neutrally charged, SO42- has a 2- charge, and overall the complex has a charge of 1+. Therefore, if cobalt is given a 3+ oxidation state, it will be added to the 2- of the sulfate resulting in the 1+ overall charge.

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