1. 1 5.4 Polyatomic Ions Chapter 5 Ionic Compounds Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

2. 2 A polyatomic ion Is a group of atoms. Has an overall ionic charge. Some examples of polyatomic ions are NH 4 + ammoniumOH − hydroxide NO 3 − nitrateNO 2 − nitrite CO 3 2− carbonatePO 4 3− phosphate HCO 3 − hydrogen carbonate (bicarbonate) Polyatomic Ions

3. 3 Some Compounds with Polyatomic Ions Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

4. 4 The names of common polyatomic anions Some end in ate. NO 3 − nitratePO 4 3− phosphate Some end in ite. NO 2 − nitritePO 3 3− phosphite Some will have hydrogen in name (or bi). HCO 3 − hydrogen carbonate (bicarbonate) HSO 3 − hydrogen sulfite (bisulfite) More Names of Polyatomic Ions

5. 5 Names and Formulas of Common Polyatomic Ions Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

6. 6 Names and Formulas of Common Polyatomic Ions Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

7. 7 Similar polyatomic ions will have similar names. ClO 4 − perchlorateone oxygen more ClO 3 − chloratemost common form ClO 2 − chloriteone oxygen less ClO − hypochlorite two oxygens less Prefixes for Names of Polyatomic Ions of Halogens

8. Parentheses If you need two or more Polyatomic ions, YOU MUST USE Parentheses with the subscript. Write the formula for Cu +2 and NO 3 -1 You need 1 Cu +2 and 2 NO 3 -1 You would write it like this: Cu(NO 3 ) 2 The 2 tells us we need 2 of the NO 3 -1 ions. 8

9. 9 The positive ion is named first followed by the name of the polyatomic ion. NaNO 3 sodium nitrate K 2 SO 4 potassium sulfate Fe(HCO 3 ) 3 iron(III) bicarbonate or iron(III) hydrogen carbonate (NH 4 ) 3 PO 3 ammonium phosphite Naming Compounds with Polyatomic Ions

10. 10 Some Compounds with Polyatomic Ions Table 5.7 Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

11. 11 Select the correct formula for each: A. aluminum nitrate 1) AlNO 3 2) Al(NO) 3 3) Al(NO 3 ) 3 B. copper(II) nitrate 1) CuNO 3 2) Cu(NO 3 ) 2 3) Cu 2 (NO 3 ) C. iron (III) hydroxide 1) FeOH2) Fe 3 OH3) Fe(OH) 3 D. tin(IV) hydroxide 1) Sn(OH) 4 2) Sn(OH) 2 3) Sn 4 (OH) Learning Check

12. 12 Select the correct formula for each: A. aluminum nitrate 3) Al(NO 3 ) 3 B. copper(II) nitrate 2) Cu(NO 3 ) 2 C. iron(III) hydroxide 3) Fe(OH) 3 D. tin(IV) hydroxide 1) Sn(OH) 4 Solution

13. 13 Match each formula with the correct name: A. MgS1) magnesium sulfite MgSO 3 2) magnesium sulfate MgSO 4 3) magnesium sulfide B. Ca(ClO 3 ) 2 1) calcium chlorate Ca(ClO) 2 2) calcium chlorite Ca(ClO 2 ) 2 3) calcium hypochlorite Learning Check

14. 14 Match each formula with the correct name: A. MgS3) magnesium sulfide MgSO 3 1) magnesium sulfite MgSO 4 2) magnesium sulfate B. Ca(ClO 3 ) 2 1) calcium chlorate Ca(ClO) 2 3) calcium hypochlorite Ca(ClO 2 ) 2 2) calcium chlorite Solution

15. 15 Learning Check Name each of the following compounds: A.Mg(NO 3 ) 2 B.Cu(ClO 3 ) 2 C.PbO 2 D.Fe 2 (SO 4 ) 3 E.Ba 3 (PO 3 ) 2

16. 16 Solution Name each of the following compounds: A.Mg(NO 3 ) 2 magnesium nitrate B.Cu(ClO 3 ) 2 copper(II) chlorate C.PbO 2 lead (IV) oxide D.Fe 2 (SO 4 ) 3 iron(III) sulfate E.Ba 3 (PO 3 ) 2 barium phosphite

17. 17 Writing Formulas with Polyatomic Ions The formula of an ionic compound Containing a polyatomic ion must have a charge balance that equals zero(0). Na + and NO 3 − →NaNO 3 With two or more polyatomic ions encloses the polyatomic ions in parentheses. Mg 2+ and 2NO 3 − → Mg(NO 3 ) 2 subscript 2 for charge balance

18. 18 Learning Check Write the correct formula for each: A.potassium bromate B.calcium carbonate C.sodium phosphate D.iron(III) oxide E.iron (II) nitrite

19. 19 Solution Write the correct formula for each: A.potassium bromateKBrO 3 B.calcium carbonateCaCO 3 C.sodium phosphateNa 3 PO 4 D.iron(III) oxideFe 2 O 3 E.iron (II) nitriteFe(NO 2 ) 2

20. 20 Naming Ionic Compounds Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings Table 5.8

21. 21 Flowchart for Naming Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

22. 22 Learning Check Name the following compounds: A. Ca 3 (PO 4 ) 2 B. FeBr 3 C. Al 2 S 3 D. Mn(NO 2 ) 2 E. NaHCO 3

23. 23 Solution Name the following compounds: A. Ca 3 (PO 4 ) 2 Ca 2+ PO 4 3− calcium phosphate B. FeBr 3 Fe 3+ Br − iron(III) bromide C. Al 2 S 3 Al 3+ S 2− aluminum sulfide D. Mn(NO 2 ) 2 Mn 2+ NO 2 − manganese(II) nitrite E. NaHCO 3 Na + HCO 3 − sodium hydrogen carbonate or sodium bicarbonate

24. 24 Learning Check Write the formulas for the following: A. calcium nitrate B. iron(II) hydroxide C. aluminum carbonate D. copper(II) bromide E. lithium phosphate

25. 25 Solution Write the formulas for the following: A. calcium nitrateCa 2+, NO 3 − Ca(NO 3 ) 2 B. iron(II) hydroxideFe 2+, OH − Fe(OH) 2 C. aluminum carbonateAl 3+, CO 3 2− Al 2 (CO 3 ) 3 D. copper(II) hypobromite Cu 2+, Br - CuBr 2 E. lithium phosphateLi +, PO 4 3− Li 3 PO 4