1. Name the following compounds:
Warm Up
Name the following compounds:
Answer:
Cl2O7
K2CrO4
N2H4
SiCl4
MnPO4
Dichlorine heptoxide
Potassium chromate
Dinitrogen tetrahydride
Silicon tetrachloride
Manganese (III) phosphate

2. Naming Acids
Acids are a group of ionic compounds with unique properties.
An acid is a compound that contains one or more hydrogen atoms and produces hydrogen ions (H+) when dissolved in water.
Chemical formula of an acid: HnX
X = monatomic anion or polyatomic anion
n = number of hydrogen atoms

3. How to name an acid… Depends on the name of the ANION
1. When the name of the anion (X) ends in –ide
A. The acid name begins with the prefix hydro-
B. The stem of the anion has a suffix –ic followed by the word acid
Example: HCl – (X = chloride) hydrochloric acid
2. When the name of the anion (X) ends in –ite
A. The stem of the anion has a suffix –ous, followed by the word acid
Example: H2SO3 – (X = sulfite) sulfurous acid
3. When the name of the anion (X) ends in –ate
A. The stem of the anion has a suffix –ic, followed by the word acid
Example: H3PO4 – (X = phosphate) phosphoric acid

4. Naming Common Acids Textbook Table 9.5 Anion Ending Example Acid Name
-ide
Chloride, Cl-
Hydro-(stem)-ic acid
Hydrochloric acid
-ite
Sulfite, SO32-
(stem)-ous acid
Sulfurous acid
-ate
Phospate, PO43-
(stem)-ic acid
Phosphoric acid

5. Practice: H2S HNO2 H2CO3 HC2H3O2 HF H2O Hydrosulfuric acid
X = sulfide
Hydrosulfuric acid
Nitrous acid
X = nitrite
Carbonic acid
X = carbonate
Acetic acid
X = acetate
Hydrofluoric acid
X = fluoride
Water is NOT an Acid pH = 7
Dihydrogen monoxide
X = oxide

6. Naming Bases
A base is an ionic compound that produces hydroxide ions when dissolved in water.
Bases are named in the same way as other ionic compounds
The name of the cation, followed by the name of the anion
Anion will always be hydroxide (OH1-)
Exception: NH3 - ammonia

7. Practice: LiOH Al(OH)3 Fe(OH)3 Mg(OH)2 Pb(OH)2 HOH Lithium hydroxide
Aluminum hydroxide
Iron (III) hydroxide
Magnesium hydroxide
Lead (II) hydroxide
Water is NOT a Base pH = 7
Dihydrogen monoxide

8. Laws Governing Formulas & Names
The Law of Definite Proportions
In samples of any chemical compound, the masses of the elements are always in the same proportion
The Law of Multiple Proportions
Whenever the same two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers

9. Compound contains a polyatomic ion
Naming a Compound:
QxRy
Q=H?
Acid:
Look at ending of anion
YES
≥ 2 elements? NO
Q=Metal? NO
Compound is binary
Ends in –ide
Q=Group A?
YES
Compound contains a polyatomic ion
Ends in –ite or -ate NO
Ionic:
Use a roman numeral
YES
Ionic:
Name the ions NO
Covalent:
Use prefixes
Q=Group A?
YES
YES
Ionic:
Name the ions
Ionic:
Use a roman numeral NO

10. Writing a Formula: Name of Compound Contains prefixes?
Covalent Compound
YES
Use prefixes to write formula.
Never reduce!
Ionic Compound NO
Roman Numerals
Polyatomic Ions
Group A Elements
Determine charges to write formula
Use Periodic Table
Charge for Cation
Reference Table
Balance Charges
Use criss-cross method. Reduce if necessary. Add parentheses for multiple polyatomic ions.