![]() ![]() Names of Some Polyatomic Ionic CompoundsĮvery day you encounter and use a large number of ionic compounds. ![]() Some of these compounds, where they are found, and what they are used for are listed in Table 9. Ionic CompoundĪdded to “iodized” salt for thyroid healthīaking soda used in cooking (and as antacid)Īnti-caking agent used in powdered productsĬompounds Containing a Metal Ion with a Variable Charge Look at the label or ingredients list on the various products that you use during the next few days, and see if you run into any of those in this table, or find other ionic compounds that you could now name or write as a formula. Most of the transition metals can form two or more cations with different charges. Compounds of these metals with nonmetals are named with the same method as compounds in the first category, except the charge of the metal ion is specified by a Roman numeral in parentheses after the name of the metal. The charge of the metal ion is determined from the formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (see Figure 2 in Chapter 2.6 Molecular and Ionic Compounds), and the two corresponding compound formulas are FeCl 2 and FeCl 3. The simplest name, “iron chloride,” will, in this case, be ambiguous, as it does not distinguish between these two compounds. In cases like this, the charge of the metal ion is included as a Roman numeral in parentheses immediately following the metal name. ![]() Names of Some Transition Metal Ionic Compounds These two compounds are then unambiguously named iron(II) chloride and iron(III) chloride, respectively. Out-of-date nomenclature used the suffixes – ic and – ous to designate metals with higher and lower charges, respectively: Iron(III) chloride, FeCl 3, was previously called ferric chloride, and iron(II) chloride, FeCl 2, was known as ferrous chloride. Though this naming convention has been largely abandoned by the scientific community, it remains in use by some segments of industry. For example, you may see the words stannous fluoride on a tube of toothpaste. This represents the formula SnF 2, which is more properly named tin(II) fluoride. ![]()
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