17.31

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Grace Kim 1J
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Joined: Fri Sep 28, 2018 12:18 am
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17.31

Postby Grace Kim 1J » Mon Dec 03, 2018 1:03 pm

Hi all! I'm having trouble figuring out how to write the formula from the given using the oxidation number.

For example...
for tetraamminediaquacobalt (III) bromide, why is the three placed with Bromine?

Thank you!

Kristen Kim 2K
Posts: 70
Joined: Fri Sep 28, 2018 12:16 am

Re: 17.31

Postby Kristen Kim 2K » Mon Dec 03, 2018 1:14 pm

The Roman numeral in the parentheses indicates the oxidation number of the transition metal in the coordination sphere, so that would mean Cobalt has a charge of +3. This would mean that there would need to be 3 Br to offset this positive charge, since Br has a charge of -1.


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