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Standard XII
Chemistry
Nucleophilic Addition at the Carbonyl
2. 20ml of 0....
Question
2. 20ml of 0.2M HCN is mixed with 10ml of 0.2M NaOH then tH is? (tKa of HCN is 5)
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Q.
20 ml of 0.2 M
H
C
N
mix with 10 ml of 0.2 M
N
a
O
H
, then calculate
p
H
of resulting mixture,
p
K
a
value of
H
C
N
is 5 :-
Q.
Calculate the volume of
0.2
N
N
a
O
H
required for neutralising the solution obtained by mixing
20
mL
of
0.1
N
H
2
S
O
4
and
20
mL
of
0.1
N
H
C
l
.
Q.
A
50
m
L
solution of
0.2
M
C
H
3
C
O
O
H
is titrated with
0.2
M
N
a
O
H
. Find the
p
H
of solution when:
(a)
0
m
L
N
a
O
H
is added (
p
H
i
n
i
t
i
a
l
)
(b)
10
m
L
of
N
a
O
H
has been added (
p
H
10
m
L
)
Given:
K
a
(
C
H
3
C
O
O
H
)
=
1.8
×
10
−
5
Q.
K
a
for
H
C
N
is
5
×
10
−
10
at
25
o
C
. For maintaining a constant
p
H
of
9
, the volume of
5
M
K
C
N
solution required to be added to
10
m
L
of
2
M
H
C
N
solution is
Q.
20
m
L
of
0.1
N
acetic acid is mixed with
10
m
L
of
0.1
N
solution of
N
a
O
H
. The
p
H
of the resulting solution is :
[Given :
p
K
a
of acetic acid is
4.74
]
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