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Tardigrade
Question
Chemistry
Solution of 0.1NH4OH and 0.1N NH4Cl has pH 9.25. Then, pKb of NH4OH is
Q. Solution of
0.1
N
H
4
O
H
and
0.1
N
N
H
4
Cl
has pH 9.25. Then,
p
K
b
of
N
H
4
O
H
is
2555
199
MGIMS Wardha
MGIMS Wardha 2009
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A
9.25
B
4.75
C
3.75
D
8.25
Solution:
pO
H
=
p
K
b
+
lo
g
[
ba
se
]
[
s
a
lt
]
∵
[
N
H
4
Cl
]
=
[
N
H
4
O
H
]
∴
pO
H
=
p
K
b
p
K
b
=
pO
H
=
14
−
p
H
=
14
−
9.25
=
4.75