Roman numeral  [ENDORSED]

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Christian Gequillo 1D
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Roman numeral

Postby Christian Gequillo 1D » Fri Nov 11, 2016 1:17 pm

When naming coordination compounds, how do identify the Roman Numeral that comes after the cation name?

Jocelyn Sandoval 3B
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Roman numeral

Postby Jocelyn Sandoval 3B » Fri Nov 11, 2016 1:27 pm

The roman numeral usually goes after the metal at the end in parenthesis and it gives the metal's oxidation state, which is basically the charge of the metal. In order to figure this out, you have to look at the charge of what is given and determine what charge of the metal would add up to that charge. Make sure to consider the charges of your ligands that are inside the coordination compound. Hope this helps!

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Re: Roman numeral

Postby Kiana_Shibata_2G » Fri Nov 11, 2016 2:07 pm

How do you know if the roman numeral given is positive or negative, because if it's a positive three and negative three it's still written the same right? Just a roman numeral three? Do you have to look at the other parts of the compound?

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Re: Roman numeral  [ENDORSED]

Postby Chem_Mod » Fri Nov 11, 2016 3:26 pm

Keep in mind what the "roman numeral" refers to: the oxidation state of the metal. Will a metal have a "-" charge/oxidation state? No.

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