naming
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 75
- Joined: Fri Sep 28, 2018 12:27 am
naming
how do we find oxidation number? is it something we have to memorize? (like how do. you know the oxidation number of CN is -1?)
-
- Posts: 32
- Joined: Fri Sep 28, 2018 12:26 am
Re: naming
For CN (Cyanide) yes you must memorize the charge of -1. There is a list on Professor Lavelles website titled "Naming Coordination Compounds" that has all the ligands you need to memorize along with their charges. If its not on there, its either a transition metal that can have multiple oxidation states or its charge can be found by simply counting which group the element is in.
-
- Posts: 33
- Joined: Fri Sep 28, 2018 12:28 am
Re: naming
I think it's helpful to just memorize the oxidation states of the molecules that we've been practicing during the lectures because they'll most likely pop up during the exam at some point and it'll be helpful if you know it right away. But if you don't, you can always try doing the Lewis structure. For cyanide, the carbon has a triple bond with nitrogen, so the carbon has a lone pair which gives it a negative charge of 1.
-
- Posts: 32
- Joined: Fri Sep 28, 2018 12:24 am
Re: naming
There are some common ligands that you should familiarize yourself with the charges. But as for finding the oxidation state of transition metals, it is based on the overall charge of the coordination compound. For example: Ag(CN)2- has an oxidation state of +1 because CN has a charge of -1 and there is 2 of them. The overall charge of the compound is -1 so therefore the charge of silver must be +1
Re: naming
For cyano- we need to know it's -1, and for the charge on metal ion we could basically calculate it.
-
- Posts: 75
- Joined: Fri Sep 28, 2018 12:27 am
Who is online
Users browsing this forum: No registered users and 11 guests