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Polyatomic Ionic Formulas

Polyatomic Ionic Formulas. Polyatomic Ions. +. What does NH 4 + mean?. Ion contains: 1 Nitrogen. N. H. H. H. H. Ion contains: 4 Hydrogens. Overall Charge: +1. Symbols for Polyatomic Ions. This charge applies to the ENTIRE ION. Symbol:. Ion Charge. NH 4. +.

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Polyatomic Ionic Formulas

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  1. Polyatomic Ionic Formulas

  2. Polyatomic Ions + • What does NH4+mean? Ion contains: 1 Nitrogen N H H H H Ion contains: 4 Hydrogens Overall Charge: +1

  3. Symbols for Polyatomic Ions This charge applies to the ENTIRE ION Symbol: Ion Charge NH4 +

  4. Writing Formulas – Equal Charges • If the charge on the cation and anion are ________, drop the charges and put the two ions together equal Example) Al3+ PO43-  AlPO4

  5. Polyatomic Ions – Unequal Charges • Let’s just look at an example with a polyatomic ion. Write the ionic formula for: Barium Nitrate What’s the problem? How could we fix it?

  6. Writing Ionic Formulas-Polyatomic Ions STEP EXAMPLE Barium Nitrate Ba2+ NO3- 1) Write the cation first, then the anion. Same as before

  7. Writing Ionic Formulas – Polyatomic Ions STEP EXAMPLE Barium Nitrate Ba2+ (NO3)- 2) Put parenthesis ( ) around the polyatomic ion or ions. Leave the charge on the outside! New Step!!

  8. Writing Ionic Formulas – Polyatomic Ions STEP EXAMPLE Barium Nitrate Ba2 (NO3)1 3) Drop the + and – (but NOT the numbers!!) Same as before

  9. Writing Ionic Formulas – Polyatomic Ions STEP EXAMPLE Barium Nitrate Ba2 (NO3)1 4) Cross the charges. Leave the crossed charges on the outside!! Ba1(NO3)2 Same as before – with a twist!!

  10. Writing Ionic Formulas – Polyatomic Ions STEP Barium Nitrate Ba1(NO3)2 EXAMPLE 5) Drop any “1”. ALSO: If you drop a “1” for a polyatomic ion, you may also drop parenthesis ( ) Ba(NO3)2 Same as before – with a twist!!

  11. Another Look • What does this mean? Ba(NO3)2 1 Ba 2 SETS of NO3 1 Ba 2 N 6 O

  12. Writing Ionic Formulas-Polyatomic Ions STEP EXAMPLE Ammonium Phosphate NH4+ PO43- 1) Write the cation first, then the anion. Same as before

  13. Writing Ionic Formulas – Polyatomic Ions STEP EXAMPLE Ammonium Phosphate (NH4)+ (PO4)3- 2) Put parenthesis ( ) around the polyatomic ion or ions. Leave the charge on the outside! New Step!!

  14. Writing Ionic Formulas – Polyatomic Ions STEP EXAMPLE Ammonium Phosphate (NH4)1 (PO4)3 3) Drop the + and – (but NOT the numbers!!) Same as before

  15. Writing Ionic Formulas – Polyatomic Ions STEP Ammonium Phosphate (NH4)1 (PO4)3 EXAMPLE 4) Cross the charges. Leave the crossed charges on the outside!! (NH4)3(PO4)1 Same as before – with a twist!!

  16. Writing Ionic Formulas – Polyatomic Ions STEP Ammonium Phosphate (NH4)3(PO4)1 EXAMPLE 5) Drop any “1”. ALSO: If you drop a “1” for a polyatomic ion, you may also drop parenthesis ( ) (NH4)3PO4 Same as before – with a twist!!

  17. Writing Ionic Formulas – Polyatomic Ions Magnesium Hydroxide EXAMPLE Mg2+ OH- Mg2+ (OH)- Mg2 (OH)1 Mg1(OH)2 Mg(OH)2

  18. Writing Ionic Formulas – Polyatomic Ions Lead (IV) Carbonate EXAMPLE Pb4+ CO32- Pb4+ (CO3)2- Pb4 (CO3)2 Pb2(CO3)4 Pb(CO3)2

  19. Writing Ionic Formulas – Polyatomic Ions Silver Chlorate EXAMPLE Ag+ ClO3- Notice: The cation charge is +1 and the anion is -1 AgClO3

  20. Names – Example 1 (NH4)2O NH4+ O2- Ammonium Oxide

  21. Names – Example 2 BaCrO4 Ba2+ CrO42- Barium Chromate

  22. Names – Example 3 Fe2(C2O4)3 Fe3+ C2O42- Iron (III) Oxalate

  23. Names – Example 4 K3PO4 K+ (PO4)3- Potassium phosphate

  24. Group Practice • Ionic Formulas and Names – Polyatomic Ions – Group Practice

  25. Group Practice - Check

  26. Group Practice - Check

  27. Group Practice - Check

  28. Group Practice - Check

  29. Group Practice - Check • (NH4)3N Ammonium Nitrate • FeSO3Iron(II) Sulfite • Fe2(SO3)3Iron(III) Sulfite • KNO3Potassium Nitrate • Cd3(BO3)2Cadmium Borate

  30. Independent Practice • Ionic Formulas and Names – Polyatomic Ions – Individual Practice • Let me know if you have any questions!!!

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