Naming coordination compounds

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Katrina_Domingo_3G
Posts: 23
Joined: Wed Sep 21, 2016 2:59 pm

Naming coordination compounds

Postby Katrina_Domingo_3G » Mon Nov 14, 2016 8:37 pm

Hi,
I was doing #2 from Quiz 3 Prep Fall 2014 and I got confused as to how the oxidation number for cobalt is +2 and how it was named... Can someone please help me with this, thank you:)

2. Name Na[Co (NH3)3Cl3]

Diana_Visco_1l
Posts: 31
Joined: Fri Jul 15, 2016 3:00 am

Re: Naming coordination compounds

Postby Diana_Visco_1l » Mon Nov 14, 2016 9:03 pm

The sodium atom on the outside of the parenthesis accounts for a charge of 1+. The ammine is 0 and the Chlorine is -3 ( -1 x 3 atoms). And because the compound is not an ion, you know the total number of oxidation numbers must equal zero (neutral). So...
1 + 0 -3 + x = 0. SOLVE FOR X (oxidation number of cobalt metal). Then you get +2 (II) for cobalt.


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