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HW 29 part C

Posted: Sun Nov 19, 2017 4:47 pm
by Michelle Steinberg2J
How do you know to add -ate to the end of cobalt? What is the difference between "aquapentacyanidocobalt" and "aquapentacyanidocobaltate"?

Also, this question uses "cyanido" for (CN) whereas part (a) uses "cyano" for (CN). What is the difference?

Thanks.

Re: HW 29 part C

Posted: Sun Nov 19, 2017 5:00 pm
by Nhan Nguyen 2F
If the complex negative charge, -ate is added to the end of the metal's name (in this case Co).
As for Cyanido vs cyano, they're the same ligand, so I think you can use them both. Correct me if I'm wrong, but hope this helps!

Re: HW 29 part C

Posted: Tue Nov 21, 2017 5:52 pm
by Isaac Eyler 1E
Yes, they are the same ligand. "Cyano" is the older version of the name whereas "cyanido" is the newer version.

Re: HW 29 part C

Posted: Thu Nov 30, 2017 2:29 am
by Nha Dang 2I
Does anyone know why cyanido is written before cobalt even though that's not alphabetical?

Re: HW 29 part C

Posted: Thu Nov 30, 2017 11:36 pm
by Nhan Nguyen 2F
Hi,
It's because cyanido is a ligand and cobalt is a metal. You'd put the ligands in ABC order, but metal you put at the end with oxidation numbers.