Name each of the following compounds, which contain...

Name each of the following compounds, which contain polyatomic ions. a. $\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}$ b. $\mathrm{Co}_{3}\left(\mathrm{PO}_{4}\right)_{2}$ c. $\mathrm{Cr}(\mathrm{CN})_{3}$ d. $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$ e. $\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}$ f. $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{3}$

Name each of the following compounds, which contain polyatomic ions.
a. $\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{3}$
b. $\mathrm{Co}_{3}\left(\mathrm{PO}_{4}\right)_{2}$
c. $\mathrm{Cr}(\mathrm{CN})_{3}$
d. $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$
e. $\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2}$
f. $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{3}$

Key Concepts

Oxidation States and Roman Numerals

Many metals, particularly transition metals, can exist in more than one oxidation state. In nomenclature, the oxidation state is indicated by a Roman numeral in parentheses immediately following the metal’s name. This provides clarity on the composition of the ionic compound by specifying the charge of the metal ion.

Naming Conventions for Transition Metals

Since transition metals can exhibit variable oxidation states, their names in ionic compounds include the specific charge indicated by a Roman numeral. This convention ensures that the correct ionic form of the metal is identified, which is essential for accurate communication of the compound’s structure and composition.

Ionic Compound Nomenclature

This concept involves the systematic approach to naming compounds composed of ions. It requires identifying the positive (cation) and negative (anion) components of the compound and naming them according to established rules. The cation’s name is typically stated first, followed by the anion’s name. This systematic approach applies to both simple ions and more complex polyatomic ions.

Polyatomic Ions

Polyatomic ions are groups of atoms that are covalently bonded together, carrying an overall charge. They have established names (such as nitrate, phosphate, sulfate, etc.) that are recognized in chemical nomenclature. Understanding these ions is crucial for naming compounds accurately, as they occur frequently in both inorganic and organic chemistry.

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