Acid-Base Reactions and Buffers
AP Chemistry · Flashcards · Application
AP CHEMISTRY · FLASHCARDS
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QUESTION
Calculate the pH of a buffer with
p
K
a
=
4.76
pK_a = 4.76
p
K
a
=
4.76
and
[
A
−
]
[
H
A
]
=
1
\frac{[A^-]}{[HA]} = 1
[
H
A
]
[
A
−
]
=
1
.
QUESTION
Calculate the pH if
[
O
H
−
]
=
1.0
×
10
−
5
M
[OH^-] = 1.0 \times 10^{-5} M
[
O
H
−
]
=
1.0
×
1
0
−
5
M
at 25°C.
QUESTION
Determine the pH if
[
H
+
]
=
2.5
×
10
−
4
M
[H^+] = 2.5 \times 10^{-4} M
[
H
+
]
=
2.5
×
1
0
−
4
M
.
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ANSWER
pH = 3.60. pH =
−
log
(
2.5
×
10
−
4
)
=
3.60
-\log(2.5 \times 10^{-4}) = 3.60
−
lo
g
(
2.5
×
1
0
−
4
)
=
3.60
.
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