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Published byJohn Cunningham Modified over 9 years ago
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Polyatomic Ions table E
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Definition polyatomic ion: group of 2 + atoms that acts as one ion and has one charge SO 4 -2
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Ammonium NH 4 +1
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Acetate CH 3 COO -1 or C 2 H 3 O 2 -1
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Carbonate CO 3 -2
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Cyanide CN -1
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Chlorate ClO 3 -1
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Nitrate NO 3 -1
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Hydroxide OH -1
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Phosphate PO 4 -3
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Sulfate SO 4 -2
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Hydromium H 3 O +1
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Ionic formulas with Polyatomic Ions What’s the formula for the compound formed from CO 3 -2 and Mg +2 ? charges must add up to zero write the symbols, positive first! MgCO 3
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Try a few more: Na +1 and OH -1 K +1 and HCO 3 -1 Mg +2 and CO 3 -2 Li +1 and NO 3 -1 - Ca +2 and SO 4 -2NaOH KHCO 3 MgCO 3 LiNO 3 CaSO 4
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These are more challenging: Mg +2 and (PO 4 ) -3 Al +3 and (NO 3 ) -1 Fe +2 and OH -1 Hg 2 +2 and SCN -1 Mg +2 and HCO 3 -1 Al +3 and C 2 O 4 -2 Mg 3 (PO 4 ) 2 Al(NO 3 ) 3 Fe(OH) 2 Hg 2 (SCN) 2 Mg(HCO 3 ) 2 Al 2 (C 2 O 4 ) 3
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Naming compounds with polyatomics 1.positive ion always written first 2.(+) ion is metal - check if more than one oxidation state - if > 1 need roman numeral in name (–) ion is polyatomic - 2 nd part name is name of polyatomic (don’t modify ending)
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Name the following NaOHNaOH KHCO 3KHCO 3 LiNO 3LiNO 3 CaSO 4CaSO 4 Al(NO 3 ) 3Al(NO 3 ) 3 Fe(OH) 2 CuSO 4 CuSCN Sodium hydroxide Potassium hydrogen carbonate Lithium nitrate Calcium sulfate Aluminum nitrate Iron (II) hydroxide Copper (II) sulfate Copper (I) thiocyanate
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Summary for Ionic Compounds with Polyatomic ions Formula: positive first, always metal > 1 oxidation state, name needs roman numeral Name = name metal + name polyatomic
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