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Writing Ionic Formulas that contain Polyatomic Ions

Learn about polyatomic ions, their role in compounds, and how to write formulas for ionic compounds containing these ions. Practice examples included for better understanding.

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Writing Ionic Formulas that contain Polyatomic Ions

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  1. Writing Ionic Formulas that contain Polyatomic Ions

  2. Objectives • Define a polyatomic ion • Given the name of a compound containing a polyatomic ion, write its formula.

  3. What is a Polyatomic Ion • Polyatomic Ion: Two or more atoms that are covalently bonded that act as a single unit. • All Polyatomic ions act as an anion ( negative charge) except for NH4 • NH4+ is the only polyatomic ion that has a positive charge, and acts as a cation.

  4. EXAMPLES OF SOME POLYATOMIC IONS (HCO3)- Hydrogen carbonate Ion (PO4)3- Phosphate Ion (NH4)+ Ammonium Ion (NO3)- Nitrate Ion

  5. Locate the Polyatomic Ions on Your Periodic Table • They are found under the Sub Heading “Common Ions” Find the columns that read, Ions. ADD THE FOLLOWING: OH- Hydroxide C2H3O2- Acetate

  6. Writing Formulas for Ionic Compounds containing Polyatomic Ions Example: Potassium Carbonate • Write the symbols for the metal and the non-metal ( or polyatomic ion). • Write the charges on the metal (cation)and the non-metal (anion) • Swap-n –drop if the positive and negative charges do not cancel out.

  7. Potassium Carbonate Example: Potassium Carbonate 1. Write the element symbols and charges K+ (CO3)2-

  8. Swap-n-Drop K2CO3

  9. Practice Examples

  10. ANSWERS • 1. Be2+SO32- BeSO3 • 2. Na+C2H3O2_ NaC2H3O2 • 3. Ca2+(NO3)- Ca(NO3)2 • 4. Al3+(NO2)- Al(NO2)3 • 5. Fe 3+ (OH)- Fe(OH)3 • 6. NH4+ PO43- (NH4)3PO4

  11. Ch. 6 Wksht #3

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