What Does the -ic Suffix Indicate in Chemistry?

In summary, the suffix -ic in compound names indicates a higher oxidation state while -ous indicates a lower oxidation state for multivalent transition metal ions. This also applies to the corresponding acids of -ate and -ite ions.
  • #1
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What does the ic suffix mean in compound names? For instance ferric, plumbic, cupric? I'm guessing it has something to do with the charge on the metal ion?
I have some nomenclature rules from my teacher but this isn't covered. Thanks.
 
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  • #2
-ic is the coplement to -ous. -ic represents the higher oxidation state; -ous the lower for multivalence transition metallic ions

ferric is equivalent to iron (III) or Fe+3
ferrous is equivilent to iron (II) or Fe+2

plumbic = Pb+4
plumbous = Pb+2

cupric = Cu+2
cuprous = Cu+

The -ic /-ous suffixes are also used for acids of -ate (1 higher oxidation state than -ite),-ite anions respectively
eg, the nitrate ion (NO3-) and nitric acid: HNO3
nitrous ion (NO2-) and nitrous acid: HNO2

or phosphate ion (PO4-3) and phosphoric acid: H3PO4
phosphite ion (PO3-3) and phosphorous acid: H3PO3
 
  • #3
Thanks, Cesium!
 

FAQ: What Does the -ic Suffix Indicate in Chemistry?

1. What does the "ic" suffix in chemical nomenclature signify?

The "ic" suffix in chemical nomenclature is used to indicate that the compound is a negatively charged acid or anion.

2. How is the "ic" suffix different from the "ous" suffix?

The "ic" suffix is used for naming anions with a higher oxidation state, while the "ous" suffix is used for naming anions with a lower oxidation state.

3. Can the "ic" suffix be used for naming cations?

No, the "ic" suffix is only used for naming anions. For cations, the suffix "ium" is used instead.

4. Is the "ic" suffix the only suffix used in chemical nomenclature?

No, there are other suffixes used in chemical nomenclature depending on the type of compound being named. For example, "ate" is used for polyatomic anions and "ide" is used for binary compounds.

5. How are compounds with multiple oxidation states named using the "ic" suffix?

Compounds with multiple oxidation states are named by including the oxidation state in parentheses after the element name. For example, iron(III) chloride is a compound with iron in its +3 oxidation state, and is named using the "ic" suffix as ferric chloride.

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