ch302 notes ch8.3

# ch302 notes ch8.3 - CH302 Chapter 8 notes part 3 Common Ion...

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CH302 Chapter 8 notes part 3 Common Ion Effects Titration Calculations pH vs. amount of acid or base added using a buret All are: ACID + BASE SALT + WATER: 1. Strong Acid + Strong Base Titration 2. Weak Acid + Strong Base Titration 3. Strong Acid + Weak Base Titration 4. Weak Acid + Weak Base Titration Each has characteristic titration curves, and specific pH ranges at the endpoint and equivalence points. The graphs can also be calculated. 1. Strong Acid/Strong Base Titration Curve As an example, consider the titration of 100.0 mL of 0.100 M perchloric acid with 0.100 M potassium hydroxide. In this case, we plot pH of the mixture vs. mL of KOH added. Note that the reaction is a 1:1 mole ratio. O H KClO KOH HClO 2 4 4 + + We will now calculate the pH at different points: 1: Initial: Before any KOH is added 2: Before the equivalence point: After a total of 20.0 mL 0.100 M KOH has been added 3: Still before the equivalence point: After a total of 50.0 mL of 0.100 M KOH has been added 4: Again, before the equivalence point: After a total of 90.0 mL of 0.100 M KOH has been added 5: At the equivalence point: After a total of 100.0 mL of 0.100 M KOH has been added 6: After the equivalence point: After a total of 150.0 mL of 0.100 M KOH has been added (YOU MIGHT WANT TO BRING SOME SCRATCH PAPER FOR THIS. IT WILL TAKE A WHILE!) Results:

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2. Weak Acid/Strong Base Titration Curve The 1 mol 1mol 1mol CH COOH + KOH K CH COO + H O 1mmol 1mmol 1mmol 3 + 3 - 2 As an example, consider the titration of 100.0 mL of 0.100
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ch302 notes ch8.3 - CH302 Chapter 8 notes part 3 Common Ion...

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