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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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

NH4+

Cyanide

CN-

Sulfite

SO32-


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.

  • 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

  • C2O4-2 oxalate

  • CO3-2 carbonate

  • Cr2O7-2 dichromate

  • CrO4-2 chromate

  • SO4-2 sulfate

  • SO3-2 sulfite


-3 polyatomic ion

  • PO4-3 phosphate

  • PO3-3 phosphite


+1 polyatomic ions

  • NH4+1 ammonium

  • H3O+1 hydronium


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!

PO43-

Phosphate

NO3-

Nitrate

PO33-

Phosphite

NO2-

Nitrite


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


Boron acetate

B3+C2H3O2-1

B(C2H3O2)3

Magnesium Dichromate

Mg+2Cr2O7-2

Mg2(Cr2O7)2

MgCr2O7


Examples (cont.)

  • Magnesium Nitrate

    • Magnesium – Mg2+

    • Nitrate - ????

    • Write the formula for the compound


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

  • 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 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


Ionic Compounds- Polyatomic IonsDue at the end of class, Completed

-1

-1

-2

-3

-1

+

+

+2


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