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Slide 1

Buffers and Acid/Base Titration

Buffers and Acid/Base Titration

Slide 2

Reaction of Weak Bases with Water

Reaction of Weak Bases with Water

The base reacts with water, producing its conjugate acid and hydroxide ion:

CH3NH2 + H2O  CH3NH3+ + OH- Kb = 4.38 x 10-4

Slide 3

Kb for Some Common Weak Bases

Kb for Some Common Weak Bases

Many students struggle with identifying weak bases and their conjugate acids.What patterns do you see that may help you?

Slide 4

Reaction of Weak Bases with Water

Reaction of Weak Bases with Water

The generic reaction for a base reacting with water, producing its conjugate acid and hydroxide ion:

B + H2O  BH+ + OH-

(Yes, all weak bases do this DO NOT

endeavor to make this complicated!)

Slide 5

Buffered Solutions

Buffered Solutions

A solution that resists a change in pH when either hydroxide ions or protons are added.

Buffered solutions contain either:

A weak acid and its salt

A weak base and its salt

Slide 6

Acid/Salt Buffering Pairs

Acid/Salt Buffering Pairs

The salt will contain the anion of the acid, and the cation of a strong base (NaOH, KOH)

Slide 7

Base/Salt Buffering Pairs

Base/Salt Buffering Pairs

The salt will contain the cation of the base, and the anion of a strong acid (HCl, HNO3)

Slide 8

Titration of an Unbuffered Solution

Titration of an Unbuffered Solution

A solution that is

0.10 M CH3COOH

is titrated with

0.10 M NaOH

Slide 9

Titration of a Buffered Solution

Titration of a Buffered Solution

A solution that is

0.10 M CH3COOH and

0.10 M NaCH3COO is titrated with

0.10 M NaOH

Slide 10

Comparing Results

Comparing Results

Buffered

Unbuffered

Slide 11

Comparing Results

Comparing Results

Unbuffered

Buffered

In what ways are the graphs different?

In what ways are the graphs similar?

Slide 12

Henderson-Hasselbalch Equation

Henderson-Hasselbalch Equation

This is an exceptionally powerful tool, and its use will be emphasized in our problem solving.

Slide 13

Weak Acid/Strong Base Titration

Weak Acid/Strong Base Titration

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