1. Teacher: Dr. Van Der Sluys
Unit 7.3 Naming Acids
Teacher: Dr. Van Der Sluys

2. Objectives
Formulas of acids
Naming acids

3. Formulas of Acids
An acid is a substance that when dissolved in water, dissociates or breaks apart into a hydrogen ion (H+) and an anion.
Acids always have hydrogen as the first element in the formula,
HCl (aq), HNO3 (aq), H2SO4 (aq), etc.

4. Naming Binary Acids
Binary acids contain only two elements, hydrogen and a monatomic anion whose name ends in the suffix -ide.
To name a binary acid like HCl
Begin the name with the prefix hydro-
Next use the root of the second elements name, e.g. chlor
Replace the suffix of the anion with the suffix -ic
Add the word acid
HCl is hydrochloric acid

5. Examples HF H2S HBr H2O Hydroiodic acid Hydronitric acid
Hydroselenic acid

6. Ternary Acids
Ternary acids contain three elements, with hydrogen being the first element in the formula and oxygen being the last.
To name a ternary acid such as H2SO4
Remove the hydrogen ion(s) and determine the formula of the anion
Replace the suffix
-ate becomes -ic acid
-ite becomes -ous acid
H2SO4 anion SO42- sulfuric acid

7. Polyatomic Ions NH4+ PO43- CO32- SO42- ClO- SO32- ClO2- CN- ClO3- NO3-
Have you memorized the polyatomic ions yet?
NH4+
ammonium
PO43-
phosphate
CO32-
carbonate
SO42-
sulfate
ClO-
hypochlorite
SO32-
sulfite
ClO2-
chlorite
CN-
cynaide
ClO3-
chlorate
NO3-
nitrate
ClO4-
perchlorate
NO2-
nitrite
OH-
hydroxide
C2H3O2-
acetate

8. Examples HClO4 H3PO4 HNO3 HNO2 Acetic acid Hypochlorous acid
Carbonic acid

9. Summary Binary Acids Ternary Acids Hydro ___ic acid
If the anion is -ate it becomes _____ic acid
If the anion is -ite it becomes _____ous acid