Titration and Buffers (5A)
MCAT · Flashcards · Application
MCAT · FLASHCARDS
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QUESTION
Find the equivalence volume:
25.0
mL
25.0\,\text{mL}
25.0
mL
of
0.100
M
0.100\,\text{M}
0.100
M
HCl titrated by
0.200
M
0.200\,\text{M}
0.200
M
NaOH.
QUESTION
Find the pH when
p
K
a
=
6.30
\text{p}K_a=6.30
p
K
a
=
6.30
and
[
A
−
]
[
H
A
]
=
10
\frac{[A^-]}{[HA]}=10
[
H
A
]
[
A
−
]
=
10
.
QUESTION
Find the pH when
p
K
a
=
4.76
\text{p}K_a=4.76
p
K
a
=
4.76
and
[
A
−
]
[
H
A
]
=
1.0
\frac{[A^-]}{[HA]}=1.0
[
H
A
]
[
A
−
]
=
1.0
.
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ANSWER
pH
=
4.76
\text{pH}=4.76
pH
=
4.76
. Using Henderson-Hasselbalch, when ratio = 1, log(1) = 0, so pH equals pKa directly.
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