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Byju's Answer
Standard XII
Chemistry
Molality
Calculate the...
Question
Calculate the
p
H
of
0.01
M solution of
N
H
4
C
N
. The dissociation constants
K
a
for
H
C
N
=
6.2
×
10
−
10
and
K
b
for
N
H
3
=
1.6
×
10
−
5
.
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Solution
p
H
=
7
+
1
2
(
p
k
a
−
p
k
b
)
p
k
a
=
−
l
o
g
k
a
⇒
−
l
o
g
(
6.2
×
10
−
10
)
⇒
10
−
0.79
=
9.21
p
k
b
=
−
l
o
g
k
b
⇒
−
l
o
g
(
1.6
×
10
−
5
)
⇒
5
−
0.20
=
4.8
7
+
1
2
[
9.21
−
4.8
]
7
+
1
/
2
[
4.41
]
=
9.21
.
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0
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