Properties of Buffers
AP Chemistry · Flashcards · Application
AP CHEMISTRY · FLASHCARDS
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QUESTION
Calculate the pH of a buffer with
[
HA
]
=
0.10
[\text{HA}] = 0.10
[
HA
]
=
0.10
M,
[
A
−
]
=
0.10
[\text{A}^-] = 0.10
[
A
−
]
=
0.10
M,
p
K
a
=
4.75
pK_a = 4.75
p
K
a
=
4.75
.
QUESTION
Determine the pH of a buffer:
p
K
a
=
4.76
pK_a = 4.76
p
K
a
=
4.76
,
[
HA
]
=
0.1
[\text{HA}] = 0.1
[
HA
]
=
0.1
M,
[
A
−
]
=
0.1
[\text{A}^-] = 0.1
[
A
−
]
=
0.1
M.
QUESTION
Calculate the pH of a buffer with
[
HA
]
=
0.10
[\text{HA}] = 0.10
[
HA
]
=
0.10
M,
[
A
−
]
=
0.10
[\text{A}^-] = 0.10
[
A
−
]
=
0.10
M,
p
K
a
=
4.75
pK_a = 4.75
p
K
a
=
4.75
.
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ANSWER
pH = 4.75. Equal concentrations make log term zero, so pH =
p
K
a
pK_a
p
K
a
.
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