AcidBase Reactions

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Acid/Base Reactions
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Figure 19.1

• Addition of Acid and Base to Unbuffered Solution

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Figure 19.2

• Addition of Acid and Base to a Buffered Solution

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Titration Table
55.0
0.00400
0.000625
0.0614
12.79
OH 0.00338
70.0
0.00400
0.00250
0.0214
12.33
OH 0.00150
81.8
0.00400
0.00398
0.000306
10.49
OH 0.000025
82.0
0.00400
-
-
7.00
0.00400
82.2
0.00400
0.00403
0.000304
3.52
H3O 0.000025
90.0
0.00400
0.00500
0.0111
1.95
H3O 0.00100
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Strong Acid/Strong Base Titration Curve
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How does the pH change as we titrate 50.00 mL of
0.100M HCH3CO2 with a 0.100 M NaOH solution?
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How does the pH change as we titrate 50.00 mL of
0.100M HCH3CO2 with a 0.100 M NaOH solution?
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Which Indicator?
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Buffering Action
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Preparation of a Buffer

• Two requirements
• Must have capacity to control the pH after an
  addition
• of reasonable amounts of acid and base.
• Must control pH around the desired value.
• Choose an acid/base conjugate pair with a Ka near
  
• The desired H3O or pH.