1. © Copyright Pearson Prentice Hall Slide 1 of 29 Naming and Writing Formulas for Ionic Compounds A recipe is a formula for the sauce—a complete list of ingredients and their proportions. Chemistry also uses formulas. Once you know the rules, you can write the formula for any chemical compound. 9.2

2. Slide 2 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds How are the names of binary ionic compounds determined? How do you write the formulas for binary ionic compounds? 9.2

3. Slide 3 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds These masks are made of an ionic compound with the common name gypsum. This name does not tell you anything about the chemical composition of the compound, though. 9.2

4. Slide 4 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds Naming Binary Ionic Compounds A binary compound is composed of two elements and can be either ionic or molecular. To name any binary ionic compound, place the cation name first, followed by the anion name. 9.2

5. Slide 5 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds Tin(II) sulfide, or SnF 2, is added to toothpastes to prevent cavities. 9.2

6. Slide 6 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds 2, Tin(IV) sulfide, or SnS 2, is used in glazes for porcelain fixtures and dishes. 9.2

7. Slide 7 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds Hematite, a common ore of iron, contains iron (III) oxide. The balanced formula is Fe 2 O 3. 9.2

8. Slide 8 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Binary Ionic Compounds Writing Formulas for Binary Ionic Compounds Write the symbol of the cation and then the anion. Add whatever subscripts are needed to balance the charges. 9.2

9. © Copyright Pearson Prentice Hall Slide 9 of 29 > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Compounds with Polyatomic Ions How do you write the formulas and names of compounds containing polyatomic ions? 9.2

10. © Copyright Pearson Prentice Hall Slide 10 of 29 > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Write the symbol for the cation followed by the formula for the polyatomic ion and balance the charges. 9.2

11. Slide 11 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions For example, calcium nitrate is composed of a calcium cation Ca 2+ and a polyatomic nitrate anion (NO 3 ) –. In calcium nitrate, two nitrate anions, each with a 1– charge, are needed to balance the 2+ charge of each calcium cation. The formula for calcium nitrate is Ca(NO 3 ) 2. 9.2

12. Slide 12 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Oysters produce calcium carbonate to form their shells and sometimes pearls. 9.2

13. Slide 13 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Lead(II)sulfate is an important component of an automobile battery. 9.2

14. Slide 14 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Naming Compounds with Polyatomic Ions To name a compound containing a polyatomic ion, state the cation first and then the anion, just as you did in naming binary ionic compounds. 9.2

15. Slide 15 of 29 © Copyright Pearson Prentice Hall > Naming and Writing Formulas for Ionic Compounds Compounds With Polyatomic Ions Sodium hypochlorite (NaClO) is used as a disinfectant for swimming pools. The metallic cation in this compound is sodium (Na + ) so the polyatomic ion must be ClO –. 9.2

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