Roman numerals
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Roman numerals
How do you know what Roman numeral to put after the name, when you're naming the compound? For example how do you know that [Fe(CN)6]4- is hexacyanidoferrate (II) and not hexacyanidoferrate (III)?
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Re: Roman numerals
The sum of each oxidation number in the coordination compound should add up to the total charge of the complex, which in this case is -4. Each CN is a -1 and there's 6 of them, so those are a total of -6. To have a sum of -4, the charge of the cation must be +2.
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Re: Roman numerals
The roman numeral refers to the oxidation state of the transition metal in question. In your example, Fe's charge is 2+, so you would use iron (II) when naming it. If its charge were to 3+, you would use iron (III).
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Re: Roman numerals
You determine roman numeral by finding the oxidation number of the metal. You determine the charge on the ligand, and if the coordination compound is an ion, then you can find the oxidation number by determining what number will make all charges true.
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