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Byju's Answer
Standard XII
Chemistry
Salt of Strong Acid and Weak Base
40 ml of 0....
Question
40
m
l
of
0.1
M
ammonia solution is mixed with
20
m
l
of
0.1
M
H
C
l
. What is the pH of the mixture?
[Given:
p
K
b
of ammonia solution is
4.74
]
A
4.74
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B
2.26
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C
9.26
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D
5.00
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Solution
The correct option is
B
9.26
Volume of the solution= 40 + 20= 60 ml
N
H
3
+
H
C
l
→
N
H
4
C
l
p
O
H
=
p
k
b
+
l
o
g
[
S
a
l
t
]
[
B
a
s
e
]
p
O
H
=
4.74
+
l
o
g
0.1
/
60
0.1
/
60
p
O
H
=
4.74
+
0
=
4.74
p
H
=
14
−
4.74
=
9.26
Option (C) is correct.
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Standard XII Chemistry
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