CHM 2046C Sample Module 12 Name: _______________

Part E. Acid-Base/pH Titration Points of Interests 10 points

1. When a weak acid is titrated against a strong base, there are five regions or possible points of interest. Describe/Explain each for both titrations:

Strong Base (BOH)-Weak Acid (HA):

First: Before base has been added,

Second: Anywhere between the start and the equivalence point,

Third: Exactly halfway to the equivalence point,

Fourth: At the equivalence point,

Fifth: Beyond the equivalence point,

Strong Acid-Weak Base:

2. When a weak base is titrated against a strong acid, there are five regions or possible points of interest. Describe/Explain each for both titrations:

First: Before acid has been added,

Second: Anywhere between the start and the equivalence point,

Third: Exactly halfway to the equivalence point,

Fourth: At the equivalence point,

Fifth: Beyond the equivalence point,

3. What are acid-base indicators. Choose appropriate indicators for the four titrations listed in question #1.