ch 15 and 6 polyatomic ions
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Ch. 15 and 6 Polyatomic Ions. Polyatomic Ions . Tightly bound groups of atoms that behave as a unit and carry a charge. Examples:. Ammonium NH 4 +. Cyanide CN -. Sulfite SO 3 2-. Common Polyatomic Ions with a -1 charge. ClO -1 hypochlorite ClO 2 -1 chlorite

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polyatomic ions
Polyatomic Ions

Tightly bound groups of atoms that behave as a unit and carry a charge.

Examples:

Ammonium

NH4+

Cyanide

CN-

Sulfite

SO32-

common polyatomic ions with a 1 charge
Common Polyatomic Ionswith a -1 charge
  • ClO-1 hypochlorite
  • ClO2-1 chlorite
  • ClO3-1 chlorate
  • ClO4-1 perchlorate
  • CN-1 cyanide
  • MnO4-1 permanganate
  • NO3-1 nitrate
  • NO2-1 nitrite
1 polyatomic ions cont
-1 polyatomic ions cont.
  • OH-1 hydroxide
  • HCOO-1formate
  • HCO3-1 hydrogen carbonate or bicarbonate
  • HSO3-1 hydrogen sulfite
  • HSO4-1 hydrogen sulfate
  • CH3COO-1 or C2H3O2-1 acetate
2 polyatomic ions
-2 polyatomic ions
  • C2O4-2 oxalate
  • CO3-2 carbonate
  • Cr2O7-2 dichromate
  • CrO4-2 chromate
  • SO4-2 sulfate
  • SO3-2 sulfite
3 polyatomic ion
-3 polyatomic ion
  • PO4-3 phosphate
  • PO3-3 phosphite
1 polyatomic ions
+1 polyatomic ions
  • NH4+1 ammonium
  • H3O+1 hydronium
polyatomic ions1
Polyatomic Ions
  • Examine Relationships
    • Most end in –ite / -ate

Trick to remember:

The bigger number ate the little number!

SO42-

Sulfate

SO32-

Sulfite

the big number ate the little number
The big number ate the little number!

PO43-

Phosphate

NO3-

Nitrate

PO33-

Phosphite

NO2-

Nitrite

writing formulas for ternary ionic compounds
Writing Formulas for Ternary Ionic Compounds

A. Contain a polyatomic ion

B. Same rules as for binary ionic compounds.

One addition – Use parenthesis if there is more than one polyatomic ion

  • Examples:
  • Calcium Hydroxide
    • Calcium - Ca2+ OH- –Hydroxide
    • Formula for compound – Ca(OH)2
slide11
Boron acetate

B3+ C2H3O2-1

B(C2H3O2)3

Magnesium Dichromate

Mg+2 Cr2O7-2

Mg2(Cr2O7)2

MgCr2O7

examples cont
Examples (cont.)
  • Magnesium Nitrate
    • Magnesium – Mg2+
    • Nitrate - ????
    • Write the formula for the compound
practice problems
Practice Problems

Write formulas for the following ternary ionic compounds:

  • Calcium Carbonate
  • Potassium Sulfate
  • Barium Nitrite
  • Magnesium Phosphate

CaCO3

K2SO4

Ba(NO2)2

Mg3 (PO4)2

naming ternary ionic compounds
Naming Ternary Ionic Compounds
  • Same rules as for naming binary ionic compounds:
    • Name the cation – Use a Roman numeral if necessary
    • Name the anion
    • Do not use the word “ion” in the compound name
practice problems1
Practice Problems:
  • Name the following ternary ionic compounds:
    • NaCN
    • KClO
    • Li2SO3
    • CaC2O4
    • Al(OH)3
    • Sn3(PO4)2

Sodium cyanide

Potassium hypochlorite

Lithium sulfite

Calcium oxalate

Aluminum hydroxide

Tin (II) phosphate

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