1. By: Chun Yi Ma and Sami Abdelkhaliq
18.4 Acid-base Titrations
By: Chun Yi Ma and Sami Abdelkhaliq

2. 18.4.1
Sketch the general shapes of graphs of pH against volume for titrations involving strong and weak acids and bases, and explain their important features.

3. Strong Base and Strong Acid Titration
25 cm3 of 0.1 M HCl titrated by 0.1 M NaOH
25 cm3 of 0.1 M NaOH titrated by 0.1 M HCl

4. Important Features Equivalence point ≠ pH 7
Equivalence Point: the point where there are exactly the same number of moles of acid and base.
Equivalence point ≠ pH 7
Buffer region: the region where there is little change to the pH in the solution that is being titrated
pKa = pH or pKb = pOH happens in the middle of the buffer region.

5. Weak Acid Titrated by Strong Base

6. Weak Base and Weak Acid 25 cm3 of 0.1 M CH3COH2 titrated by 0.1 M NaOH
25 cm3 of 0.1 M NH3 titrated by 0.1 M HCl

7. Strong Base and Strong Acid Titration

8. Weak Acid Titrated by a Strong Base

9. Weak Base Titrated by a Strong Acid

10. Features of Equivalence Points
Strong base and strong acid titration
Equivalence point = 7
Weak acid titrated by a strong base
Equivalence point > 7
Weak base titrated by a strong acid
Equivalence point < 7

11. What Can Be Deduced From This Graph?
Equivalence Point
Volume of acid added (cm3)