Naming Ionic compounds Latin Names

Naming Ionic compounds
• Binary Compounds
– Name the cation – always comes first
– Indicate the charge on the cation if necessary
• Transition metals can form more than one
• Roman numerals or Latin names are used
to identify the ion
– Name the anion
• Use the beginning of the anion followed by
the suffix “ide”
Write the formula for the ionic compound that will form
between Ba2+ and Cl−.
1. Balance charge with + and – ions
2. Write the positive ion of metal first, and the
negative ion
3. Write the number of ions needed as
Names of Variable Metallic Ions
Write the correct formula for the compounds
containing the following ions:
1. Na+, S2a) NaS
b) Na2S
c) NaS2
2. Al3+, Cla) AlCl3
b) AlCl
c) Al3Cl
3. Mg2+, N3a) MgN
b) Mg2N3
c) Mg3N2
These elements REQUIRE Roman Numerals because they
can have more than one possible charge:
any metal except alkali metals, alkaline earth metals,
Ag, Zn, Cd, and Al
(You should already know the charges on these!)
Or another way to say it is: Transition metals and the metals in groups
4A and 5A (except Ag, Zn, Cd, and Al) require a Roman Numeral.
(Fe3+) iron (III) chloride
(Cu+ ) copper (I) chloride
(Sn4+) tin (IV) fluoride
(Pb2+) lead (II) chloride
(Fe3+) iron (III) sulfide
Latin Names
• Copper
– +1 cuprous
– +2 cupric
• Iron
– +2 ferrous
– +3 ferric
• Lead
– +2 plumbous
– +4 plumbic
• Tin
– +2 stannous
– +4 stannic
• Mercury
• +1 mercurous
• +2 mercuric
• Ternary compounds – more than 2 elements
– Name the cation
– Name the anion (usually a polyatomic ion)
• Polyatomic ions
– The most common form of the ion uses the suffix
– Adding one oxygen to the common form adds the
prefix “per”
– Removing one oxygen from the common form
changes the suffix to “ite”
– Removing an oxygen from the “ite” form adds the
prefix “hypo”
Naming Molecular Compounds
• Adding a hydrogen to any polyatomic ion adds the
prefix “bi” and a positive one to the charge
• Replacing an oxygen with sulfur in any polyatomic ion
adds the prefix :thio”
• Name the first element
– Use prefixes to indicate the number of atoms of that element
(mono is never used on the first element)
• Name the second element changing the ending to “ide”
– Use prefixes to indicate the number of atoms of that element
• 1 – mono
• 2 – di
• 3 – tri
• 4 – tetra
• 5 – penta
• 6 – hexa
• 7 – hepta
• 8 – octa
• 9 – nona
• 10 – deca
Naming Acids
• You recognize that the compound is an acid when it
begins with hydrogen
– Binary acids
• Acids with only two elements
• Prefix is always hydro
• Name the second element using the suffix “ic”
– EX: HCl
• Hydrochloric acid
– H3P
• Hydrophosphoric acid
• Ternary acids – the name depends on which
polyatomic ion is in the acid
– If the polyatomic ion ends in “ate”, the acid ends in “ic”
– If the polyatomic ion ends in “ite” the acid ends in “ous”
– Examples
• HClO3
– Chloric acid
• HClO2
– Chlorous acid
• HClO4
– Perchloric acid
• HClO
– Hypochlorous acid