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Polyatomic Ions

Polyatomic Ions. table E. Definition. polyatomic ion : group of 2 + atoms that acts as one ion and has one charge SO 4 -2. Ammonium NH 4 +1. Acetate CH 3 COO -1 or C 2 H 3 O 2 -1. Carbonate CO 3 -2. Cyanide

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Polyatomic Ions

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  1. Polyatomic Ions table E

  2. Definition polyatomic ion: group of 2+ atoms that acts as one ion and has one charge SO4-2

  3. Ammonium NH4+1

  4. Acetate CH3COO -1 or C2H3O2-1

  5. Carbonate CO3-2

  6. Cyanide CN -1

  7. Chlorate ClO3-1

  8. Nitrate NO3-1

  9. Hydroxide OH -1

  10. Phosphate PO4-3

  11. Sulfate SO4-2

  12. Hydromium H3O +1

  13. Ionic formulas with Polyatomic Ions • What’s the formula for the compound formed from CO3-2 and Mg+2? • charges must add up to zero • write the symbols, positive first! MgCO3

  14. Try a few more: • Na+1 and OH-1 • K +1 and HCO3-1 • Mg+2 and CO3-2 • Li +1 and NO3-1 • -Ca+2 and SO4-2 NaOH KHCO3 MgCO3 LiNO3 CaSO4

  15. These are more challenging: • Mg+2 and (PO4)-3 • Al+3 and (NO3)-1 • Fe+2 and OH-1 • Hg2+2 and SCN-1 • Mg+2 and HCO3-1 • Al+3 and C2O4-2 Mg3(PO4)2 Al(NO3)3 Fe(OH)2 Hg2(SCN)2 Mg(HCO3)2 Al2(C2O4)3

  16. Naming compounds with polyatomics • positive ion always written first • (+) ion is metal - check if more than one oxidation state - if > 1 need roman numeral in name • (–) ion is polyatomic - 2nd part name is name of polyatomic (don’t modify ending)

  17. Name the following Sodium hydroxide • NaOH • KHCO3 • LiNO3 • CaSO4 • Al(NO3)3 • Fe(OH)2 • CuSO4 • CuSCN Potassium hydrogen carbonate Lithium nitrate Calcium sulfate Aluminum nitrate Iron (II) hydroxide Copper (II) sulfate Copper (I) thiocyanate

  18. Summary for Ionic Compounds with Polyatomic ions • Formula: positive first, always • metal> 1oxidation state, name needsroman numeral • Name = name metal + name polyatomic

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