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Question
Chemistry
How much sodium acetate should be added to 0.1 M solution of CH3COOH to give a solution of pH 5.5. ( pKa of CH3COOH=4.5 ) ?
Q. How much sodium acetate should be added to
0.1
M
solution of
C
H
3
COO
H
to give a solution of
p
H
5.5
. (
p
K
a
of
C
H
3
COO
H
=
4.5
) ?
2747
186
AMU
AMU 2005
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A
0.1 M
B
0.2 M
C
1.0 M
D
10.0 M
Solution:
p
H
=
p
K
a
+
lo
g
[acid]
[salt]
Here,
p
H
=
5.5
,
p
K
a
=
4.5
Concentration of
C
H
3
COO
H
=
0.1
M
p
H
=
p
K
a
+
lo
g
[
C
H
3
COO
H
]
[
C
H
3
COON
a
]
5.5
=
4.5
+
lo
g
0.1
[
C
H
3
COON
a
]
1.0
=
lo
g
0.1
[
C
H
3
COON
a
]
10
=
0.1
[
C
H
3
COON
a
]
[
C
H
3
COON
a
]
=
10
×
0.1
=
1.0
M