Writing and naming chemical formulas of ionic compounds

A worksheet on writing formulas for ionic compounds.

Writing and naming chemical formulas of ionic compounds

Phosphate ion PO Pattern 1: For instance, if you know nitrate is NO3-,then nitrite is NO If you know phosphate is PO,then you know phosphite is PO You can also use the prefixes hypo- and per- with the chlorate series.

Hypochlorite is a double whammy: You can also substitute the other halogens for Cl and make additional sets of the series.

The -ates with charges less than negative 1 that is, ions with charges of -2, -3, etc. HCO3-is called either the bicarbonate ion or the hydrogen carbonate ion. These are named hydrogen phosphate and dihydrogen phosphate, respectively.

writing and naming chemical formulas of ionic compounds

That means you need to see the naming acids rules. The following periodic table will also come in handy. Working backward from the halogens, or 7A family, the oxidation states are most commonly -1, while the 6A family is -2, and the 5A family is Naming acids is extremely easy if you know your polyatomic ions.

Changing the Number of Oxygens

There are three rules to follow: HCl is hydrochloric acid; H2S is hydrosulfuric acid. When you see an acid name beginning with hydro- think: HCN is an exception since it is a polyatomic ion without oxygen, so it is named hydrocyanic acid.

writing and naming chemical formulas of ionic compounds

If the acid has an -ate polyatomic ion after the H, that makes it an -ic acid. H2SO4 is sulfuric acid. When the acid has an -ite polyatomic ion after the H, that makes it an -ous acid.

H2SO3 is sulfurous acid.In chemical formulas the less electronegative atom is usually written first and the more electronegative atom is usually written last, eg, H2O, BaBr2, AlF3, SO2, etc. Exceptions include NH3, CH4, and other organic compounds.

Patterns for Polyatomic Oxyanions. Notice how the four polyatomic-ate ions in the center square (phosphate, arsenate, sulfate, and selenate) all have four oxygen atoms, while the polyatomic -ate ions on the outside all have three oxygen atoms.; As you start from right-hand side, the first column of polyatomic -ate ions (chlorate, bromate, iodate) all have a 1- charge.

Learn how to name monatomic ions and ionic compounds containing monatomic ions, predict charges for monatomic ions, and understand formulas. About This Quiz & Worksheet. Assess your knowledge of the composition of ionic formula compounds with this quiz and worksheet.

Key Concepts

Assessments items will test you on several formulas and other. How to Name Chemical Compounds. In this Article: Article Summary Naming Ionic Compounds Naming Polyatomic Compounds Naming Covalent Compounds Community Q&A Naming basic chemical compounds is essential if you want to succeed in chemistry, since the name of the compound clearly defines what it is.

About This Quiz & Worksheet. Assess your knowledge of the composition of ionic formula compounds with this quiz and worksheet.

Assessments items will test you on several formulas and other.

3 Ways to Name Ionic Compounds - wikiHow