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Polyatomic Ions

Polyatomic Ions. Compounds & Nomenclature. Objectives Covered Today. 6. Define a polyatomic ion 7. C4.2c Name compounds containing a polyatomic ion. 8. C4.2d Given the name of a compound containing a polyatomic ion, write its formula. Objective 6. Define a polyatomic ion

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Polyatomic Ions

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  1. Polyatomic Ions Compounds & Nomenclature

  2. Objectives Covered Today 6. Define a polyatomic ion 7. C4.2c Name compounds containing a polyatomic ion. 8. C4.2d Given the name of a compound containing a polyatomic ion, write its formula.

  3. Objective 6 Define a polyatomic ion Polyatomic Ion: An ion (either positively or negatively charged) composed of two or more atoms.

  4. Is it possible to predict charges? • Based on covalent bonding (next chapter) • Charges of polyatomic ions are still based on the overall stability of the molecule • Not as predictable as monatomic ions • These will have to be memorized • However, this becomes easy with practice

  5. Common Examples HCO32- Bicarbonate Ion PO43- Phosphate Ion NH4+ Ammonium Ion NO3- Nitrate Ion

  6. Objective 7 Name compounds containing a polyatomic ion Example: NaNO3 • If the compound contains a metal cation, the name of the metal comes first.

  7. Objective 7 Name compounds containing a polyatomic ion Example: NaNO3 • If the compound contains a metal cation, the name of the metal comes first. Sodium

  8. Objective 7 Name compounds containing a polyatomic ion Example: NaNO3 2. The second part of the name is just the name of the polyatomic ion Sodium

  9. Objective 7 Name compounds containing a polyatomic ion Example: NaNO3 2. The second part of the name is just the name of the polyatomic ion Sodium Nitrate

  10. What if the Polyatomic Ion comes first? NH4+(Ammonium ion) is a positive ion while still being polyatomic If you are using a polyatomic cation you just use the ion’s name, and it will be written first NH4Cl

  11. What if more than one Polyatomic Ion is needed? Compounds must be neutral! • If > 1 polyatomic ion is needed in a formula, it will be put in parentheses before the subscript • When writing its name, it will just remain the name of the polyatomic ion Al2 (SO4)3

  12. Objective 8 Given the name of a compound containing a polyatomic ion, write its formula. Example: Potassium Carbonate 1. Determine atomic symbols and charges

  13. Objective 8 Given the name of a compound containing a polyatomic ion, write its formula. Example: Potassium Carbonate 1. Determine atomic symbols and charges K+ CO32-

  14. Objective 8 Given the name of a compound containing a polyatomic ion, write its formula. Example: Potassium Carbonate 2. Determine number of each ion to balance charges K+ CO32-

  15. Objective 8 Given the name of a compound containing a polyatomic ion, write its formula. Example: Potassium Carbonate 2. Determine number of each ion to balance charges 2K+1CO32-

  16. Objective 8 Given the name of a compound containing a polyatomic ion, write its formula. Example: Potassium Carbonate 3. Using symbols for both ions and proper subscripts, write the formula K2CO3

  17. Practice Examples

  18. Happy Thanksgiving Break!

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