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Posted: Mon Dec 03, 2018 1:03 pm
by Grace Kim 1J
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!

Re: 17.31

Posted: Mon Dec 03, 2018 1:14 pm
by Kristen Kim 2K
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.