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shape when given a formula for a complex ion

Posted: Sun Dec 06, 2015 1:14 am
by Mariah Tumbaga 1e
how do you figure out the shape from a formula?
ex: [Co(en)2(Br)2]
it is octahedral but why?

Re: shape when given a formula for a complex ion

Posted: Sun Dec 06, 2015 1:18 am
by Samantha Miceli 3J
Ethylenediamine is bidentate, so it can form two bonds. Because there are two of these and two bromine attached to Cobalt, there are six bonds total. This gives a VSEPR formula of AX6, which is octahedral.