HNO 2 HNO 3 Which is the stronger base N O 2 N O 3 AcidBase Reactions strong acid strong base strong acid weak base weak acid strong base weak acid weak base Extent of Weak AcidWeak Base Reactions ID: 230849
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Slide1
Which is the stronger acid?
HNO
2
HNO
3Slide2
Which is the stronger base?
N
O
2-NO3-Slide3
Acid-Base Reactions
strong acid + strong base
strong acid + weak base
weak acid + strong base
weak acid + weak baseSlide4
Extent of Weak Acid-Weak Base ReactionsSlide5
pK
a
and Acid Strength
pK
a
= -log K
a
K
a
pK
a
Trends:Slide6
BuffersSlide7
How Buffers Minimize pH Changes
NH
4
+
/NH
3
buffer
If an acid is added:
If a base is added:Slide8
What controls pH of a buffer?Slide9Slide10Slide11
What controls pH of a buffer?Slide12
Buffer pH
Two cases:
When the acid and base of interest are in bulk and control the pH
When other acids and bases are in bulk and the acid/base state of the
species of interest is controlled by the pH (ex: indicators)Slide13
1a. Buffer pH
What is the pH of a solution with [H
2
CO
3
] = 0.25 M and [HCO
3
-
] = 0.25 M?Slide14
1b. Buffer pH
What is the pH of a solution with [H
2
CO
3
] = 0.25 M and [HCO
3
-
] = 0.11 M?Slide15Slide16Slide17Slide18
pH Titration Curves
Strong Acid – Strong Base
Strong Base – Strong AcidSlide19
pH Titration Curves
Weak Acid – Strong Base: Finding
K
aSlide20
pH Titration Curves
Strong Acid – Weak Base: Finding
K
bSlide21
Polyprotic
Acids
H
2
CO
3
HCO
3
-
CO
32-
K
a1
= 4.2 x 10
-7
K
a2
= 4.8 x 10
-11
What is the pH of a 0.10 M solution of H
2
CO
3
?
What is [CO
3
2-
] in this solution?Slide22
Polyprotic
Acids
H
2
CO
3
HCO
3
-
CO3
2-
K
a1
= 4.2 x 10
-7
K
a2
= 4.8 x 10
-11Slide23
Polyprotic
pH Titration CurvesSlide24Slide25
When pH Controls Acid-Base State: Amino Acids
Situations where an acid-base species is a minor component in a solution where other things control the
pH. Henderson-Hasselbalch and Alpha plots.Slide26
When pH Controls Acid-Base State: Amino Acids
Situations where an acid-base species is a minor component in a solution where other things control the
pH.
pH = 0.00 pH = 2.34
Slide27
pH = 0.00 pH = 2.34 pH = 7.00
pH = 9.60 pH = 13.00Slide28
Alpha Plots