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Nomenclature of Ionic Compounds with Oxo Anions

Nomenclature of Ionic Compounds with Oxo Anions -...

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Nomenclature of Ionic Compounds with Oxo Anions Ionic compounds are named by stating the cation name and then the anion name. The number of cations and anions is not specified in an ionic compound. The number of each is understood because the overall charge must equal zero. Some ionic compounds have more complicated anions. 'Oxo' anions are composed of an element with one or more oxygens attached to it. Nitrate = NO 3 - Sulfate = SO 4 2- . You must treat the oxo anion as a group. Never break it up into elements. Oxo anions always have the suffix 'ate' or 'ite' . Learn (memorize) the names and formulas for the ate anions. There is no simple way to use the Periodic Table to determine their formulas or charges. Once you know these, it is easy to constuct the ite anions. ate anions to learn Nitrate NO 3 - Acetate CH 3 COO - Chlorate ClO 3 - Carbonate CO 3 2- Sulfate SO 4 2- Chromate CrO 4 2- Phosphate PO 4 3- Examples: Potassium sulfate = K 2 SO 4 There must be 2 potassium 1+ cations because sulfate anion has a 2- charge.
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