1. Lesson 8: Solubility and Titrations
Unit 3: Solubility
Lesson 8: Solubility and Titrations

2. Solubility and Titrations
Review: In a titration, we react one solution (with known volume and known concentration) with another solution (with known volume and unknown concentration) until the endpoint is reached.
New: We can use the formation of a precipitate to indicate the endpoint of a titration!

3. Example: Chloride Titration
Ag+ will react with both Cl- and CrO42- in order to form precipitates.
But AgCl forms preferentially over Ag2CrO4!
Ag2CrO4 (red in colour) will not form until virtually all of the Cl- has been used up.
At this point, the moles of Ag+ added equals the moles of Cl- in the original solution – this is the endpoint of the titration!

4. Brain Break – Spot 21 Differences!

5. Demo of a Chloride Titration
0.10 M Ag+
15 min including calculation of result
10.0 mL of Cl- (unknown) and a few drops of 0.10 M CrO42-

6. Practice Time!
Pg. 101 #70-75
Expect a quiz on these questions!
15 min