## Naming

904472058
Posts: 4
Joined: Fri Sep 26, 2014 2:02 pm

### Naming

How do you calculate the oxidation number of a complex?

Eduardo Torres 3G
Posts: 13
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Naming

To calculate the oxidation number of the metal in the compound first you must look at the other elements and compounds that are attached to it and determine its charge from there. For example, in [CoCl(NH3)5]Cl2, you are expected to know that Cl has a charge of -1 and NH3 has a charge of 0. Since there are 3 Cl, there is a negative charge of -3. Because the net charge of the coordination compound is 0, the Co must have a charge of +3 making it cobalt(III).

Eduardo Torres 3G
Posts: 13
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Naming

And say the complex were [CoCl(NH3)5]Cl2-, the Co will have a +2 charge because the complex has to have a net charge of -1. So this time we have cobalt(II). I hope this answers your question.

904472058
Posts: 4
Joined: Fri Sep 26, 2014 2:02 pm

Thank you!!