Ligand charge

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juliefilice 4A
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

Ligand charge

Postby juliefilice 4A » Tue Nov 27, 2018 10:18 pm

Lavelle said in class that we can use the charge of the ligands to figure out the oxidation number of the central atom. He used the example Fe(CN)6^4- with an oxidation number or 2+. How do we know the charge of the CN molecules?

Matthew Tran 1H
Posts: 165
Joined: Fri Sep 28, 2018 12:16 am

Re: Ligand charge

Postby Matthew Tran 1H » Wed Nov 28, 2018 12:13 am

The cyanide ion (CN-) is an common ion that you should have memorized by now.

Sam Kelly 1K
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Ligand charge

Postby Sam Kelly 1K » Wed Nov 28, 2018 3:13 pm

Like Matthew said, CN- is a common polyatomic ion that we are expected to know for tests and such. (Don't feel bad if you didn't have it memorized, just try to incorporate them into hw problems to the point where they become natural.) Using the knowledge that CN has a -1 charge, you can figure out that Fe has a 2+ charge in this case using this:
(-1*6) + x = -4
x = +2

Here is a comprehensive list of the basic polyatomic ions you should know:
https://ch301.cm.utexas.edu/help/ch301/polyatomics.pdf

juliefilice 4A
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

Re: Ligand charge

Postby juliefilice 4A » Thu Nov 29, 2018 9:08 pm

Thank you Sam that was super helpful!

Anjali_Kumar1F
Posts: 62
Joined: Fri Sep 28, 2018 12:25 am

Re: Ligand charge

Postby Anjali_Kumar1F » Thu Nov 29, 2018 10:02 pm

Do we need to know the biological importance for the final?


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