Focusing on 14 common Polyatomic Ions (The S.A. CHEM 1000-1025 List )
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| Acetate | (C2H3O2)-1
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| Carbonate | (CO3)-2
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| Nitrite | (NO2)-1
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| Nitrate | (NO3)-1
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| Sulfite | (SO3)-2
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| Sulfate | (SO4)-2
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| Phosphate | (PO4)-3
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| Chromate | (CrO4)-2
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| Dichromate | (Cr2O7)-2
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| Permanganate | (MnO4)-1
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| Hydroxide | (OH)-1
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| Cyanide | (CN)-1
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| Bicarbonate | (HCO3)-1
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| Bisulfite | (HSO3)-1
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| Bisulfate | (HSO4)-1
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| What happens when you add a Hydrogen to a Polyatomic Ion? | You add a Bi- prefix to the Ionic name and adjust the charge to include the H+1.
Example: Sulfate(-2) becomes Bisulfate(-1).
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| Ammonium | (NH4)+1
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| Hydronium | (H3O)+1
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| Are Cations positive or negative? | They are positive. An easy way to remember is to use the "t" in Cat:
Cat ions
Ca+ ions
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| Are Anions positive or negative? | They are negative. An easy way to remember is the "n" in An
aN ion
a(-) ion
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| Name two (+1) Polyatomic Cations. | Ammonium & Hydronium
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| Name six (-1) Polyatomic Anions. (do not include any of the Bi- hydrogens) | Acetate, Nitrate, Nitrite, Permanganate, Hydroxide, Cyanide
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| Name five (-2) Polyatomic Anions. (do not include any of the Bi- Hydrogens) | Carbonate, Sulfate, Sulfite, Chromate, Dichromate
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| Name one (-3) Polyatomic Anion. | Phosphate
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| Adding or subtracting Oxygen to a Polyatomic Anion changes: 1. Its name 2. Its charge 3. Both its name and charge 4. Neither its name or charge | Changes: 1. Its name
Ex:
Sulfite (SO3)-2
Sulfate (SO4)-2
Nitrite (NO2)-1
Nitrate (NO3)-1
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| Adding or subtracting Hydrogen to a Polyatomic Anion changes: 1. Its name 2. Its charge 3. Both its name and charge 4. Neither its name or charge | Changes: 3. Both its name and charge
Ex:
Carbonate (CO3)-2
Bicarbonate (HCO3)-1
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Created by:
BerScott
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