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Question
What is the oxidation state of Co in the complex, [Co(NH3)2(NO2)Cl][Au(CN)2]?
Very Long Answer
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Solution
The oxidation state of Co in the complex:
[Co(NH3)2(NO2)Cl][Au(CN)2]
The complex has two parts:
- Cation: [Co(NH3)2(NO2)Cl]+
- Anion: [Au(CN)2]−
Since the anion [Au(CN)2]− has a –1 charge, the cation [Co(NH3)2(NO2)Cl]+ must have a +1 charge to balance the overall charge (because the salt is neutral).
In the cation [Co(NH3)2(NO2)Cl]+:
-
NH3 (ammonia) is neutral → charge = 0
-
NO2– (nitrito) is –1 → charge = –1
-
Cl– (chloride) is –1 → charge = –1
Let the oxidation state of Co be x.
x + 2(0) + (–1) + (–1) = +1
x – 2 = +1
x = +3
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Chapter 9: Coordination Compounds - Review Exercises [Page 517]
