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WBJEE 2016 Chemistry Solved Paper
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© examsnet.com
Question : 40
Total: 40
In which of the following mixed aqueous solutions pH = pKa at equilibrium?
(1) 100 ml of 0.1M
C
H
3
C
O
O
H
+ 100 ml of 0.1M
C
H
3
C
O
O
N
a
(2) 100 ml of 0.1M
C
H
3
C
O
O
H
+ 50 ml of 0.1M
N
a
O
H
(3) 100 ml of 0.1M
C
H
3
C
O
O
H
+ 100 ml of 0.1M
N
a
O
H
(4) 100 ml of 0.1M
C
H
3
C
O
O
H
+ 100 ml of 0.1M
N
H
3
(1) is correct
(2) is correct
(3) is correct
Both (1) and (2) are correct
Validate
Solution:
A) pH = p
K
a
+ log
(
0.1
×
100
0.1
×
100
)
=
p
K
a
(correct) ( acidic buffer)
B)
C
H
3
C
O
O
H
10
m
mol
5
m
mol
+
N
a
O
H
5
m
mol
0
→
C
H
3
C
O
O
−
N
a
+
0
5
m
mol
+
H
2
O
0
5
m
mol
acidic buffer fored
pH =
p
K
a
+
log
(
5
5
)
=
p
K
a
(correct)
C)
C
H
3
C
O
O
H
10
m
mol
0
+
N
a
O
H
10
m
mol
0
→
C
H
3
C
O
O
−
N
a
+
0
10
m
mol
+
H
2
O
0
10
m
mol
pH =
1
2
(
p
K
w
+
p
K
a
+
l
o
g
c
)
=
1
2
[
14
+
p
K
a
+
l
o
g
(
10
100
)
]
(incorrect) (anionic hydrolysis)
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