Ionic Compounds

1
Ionic Compounds

• Chapter 6 Section 4

2
Writing Formulas

• Nomenclature the naming of compounds
• Substances used to have common names
• Salt, sugar, soda ash, milk of magnesia
• Increase in the number of compounds led to the
  need for a naming system
• Binary Compounds
• composed of two pieces
• Ternary Compounds composed of three elements

3
Ionic Compounds

• Formed between cations and anions
• Binary and Ternary compound naming
• Name the cation.
• Name the anion.
• If the cation can have multiple charges use a
  roman numeral to indicate the charge.
• Examples CaS
• FeCl2
• NaOH

Calcium sulfide
Iron (II) chloride
Sodium hydroxide
4

• Formula writing
• Know your ions (symbols and charges)
• Write the cations symbol first
• Write the anions symbol
• Balance the charges so that the sum is zero
• Use parenthesis only if more than one of the
  indicated polyatomic ion is needed.

5
Write the Following Formulas

• Examples
• Lithium bromide
• Copper (II) oxide
• Sodium nitrate
• Ammonium sulfide
• Strontium acetate

LiBr
NaNO3
Sr(C2H3O2)2
CuO
(NH4)2S
6
Changing the Suffix and Prefix

• The suffix and/or prefix of a polyatomic ion must
  be changed to reflect a difference in the number
  of oxygen atoms from the base ion.
• 1 less oxygen -ite
• 2 less oxygens Hypo- -ite
• 1 more oxygen per-
• See the common ion sheet for examples.