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Standard XII
Chemistry
Reactions of Aryl Amines (Diazo Salts)
Q 9/15 Calcul...
Question
Q 9/15 Calculate pH of 0.1 M solution of NH4CI. Thedissociation constant (K) of NH3 is 1.8 x 10578.885.124.28
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Q.
A buffer solution with pH 9 is to be prepared by mixing
N
H
4
C
I
and
N
H
4
O
H
. Calculate the number of moles of
N
H
4
C
I
that should be added to 1 liter of 1M
N
H
4
O
H
.
K
b
(
N
H
4
O
H
)
=
1.8
∗
10
−
5
.
Q.
A buffer solution with
p
H
=
9
is to be prepared by mixing
N
H
4
C
I
and
N
H
4
O
H
. Calculate the number of moles of
N
H
4
C
I
that should be added to one litre pf
1.0
M
N
H
4
O
H
.
[
K
b
=
1.8
×
10
−
5
]
Q.
Calculate the pH of a solution which is 0.1 M in HA and 0.5M in NaA. Ka for HA is
1.8
×
10
−
6
?
Q.
A solution has
0.05
M
M
g
2
+
and
0.05
M
N
H
3
. Calculate the concentration of
N
H
4
C
l
required to prevent the formation of
M
g
(
O
H
)
2
in solution.
K
s
p
M
g
(
O
H
)
2
=
9
×
10
−
12
and ionisation constant of
N
H
3
is
1.8
×
10
−
5
Q.
Calculate the pH of the buffer solution prepared by mixing, 50 ml of 0.1 M
N
H
4
O
H
and 25 ml of 2 M
N
H
4
C
I
(
p
K
b
of
N
H
4
O
H
is 4.8).
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