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Polyatomic Ions Ch.2

Focusing on 14 common Polyatomic Ions (The S.A. CHEM 1000-1025 List )

QuestionAnswer
Acetate (C2H3O2)-1
Carbonate (CO3)-2
Nitrite (NO2)-1
Nitrate (NO3)-1
Sulfite (SO3)-2
Sulfate (SO4)-2
Phosphate (PO4)-3
Chromate (CrO4)-2
Dichromate (Cr2O7)-2
Permanganate (MnO4)-1
Hydroxide (OH)-1
Cyanide (CN)-1
Bicarbonate (HCO3)-1
Bisulfite (HSO3)-1
Bisulfate (HSO4)-1
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).
Ammonium (NH4)+1
Hydronium (H3O)+1
Are Cations positive or negative? They are positive. An easy way to remember is to use the "t" in Cat: Cat ions Ca+ ions
Are Anions positive or negative? They are negative. An easy way to remember is the "n" in An aN ion a(-) ion
Name two (+1) Polyatomic Cations. Ammonium & Hydronium
Name six (-1) Polyatomic Anions. (do not include any of the Bi- hydrogens) Acetate, Nitrate, Nitrite, Permanganate, Hydroxide, Cyanide
Name five (-2) Polyatomic Anions. (do not include any of the Bi- Hydrogens) Carbonate, Sulfate, Sulfite, Chromate, Dichromate
Name one (-3) Polyatomic Anion. Phosphate
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
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
Created by: BerScott
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