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Byju's Answer
Standard VII
Chemistry
pH Scale
What is pH of...
Question
What is pH of
2
×
10
−
8
M
H
C
l
solution?
(Here, log
2
=
0.301
and log
3
=
0.477
)
A
6.92
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B
9.5
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C
5.4
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D
7.7
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Solution
The correct option is
A
6.92
As solution is very dilute,
∴
[
H
+
]
=
[
H
+
]
w
a
t
e
r
+
[
H
+
]
H
C
l
=
10
−
7
+
2
×
10
−
8
=
12
×
10
−
8
∴
p
H
=
−
l
o
g
[
12
×
10
−
18
]
=
−
l
o
g
[
2
2
×
3
×
10
−
8
]
=
−
[
2
l
o
g
(
2
)
+
l
o
g
(
3
)
+
l
o
g
(
10
−
8
)
=
6.92
.
Option A is correct.
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0
Similar questions
Q.
A
1.458
g of Mg reacts with
80.0
ml of a
H
C
l
solution whose pH is
−
0.477
. The change is pH when all
M
g
has reacted will be:
Assume constant volume.
M
g
=
24.3
g
/
m
o
l
(
l
o
g
3
=
0.47
,
l
o
g
2
=
0.301
)
Q.
What is the pH of
2
×
10
−
8
M
H
C
l
solution ?
(Take
l
o
g
(
11
)
=
1.04
)
Q.
If
x
=
(
0.15
)
20
, then find the mantissa of the logarithm of
x
to the base
10
.
Assume
log
10
2
=
0.301
and
log
3
10
=
0.477
.
Q.
50
m
L
of
0.05
M
N
a
2
C
O
3
is titrated against
0.1
M
H
C
l
. On adding
40
m
L
of
H
C
l
,
p
H
of the solution will be
[Given for
H
2
C
O
3
,
p
K
a
1
=
6.35
;
p
K
a
2
=
10.33
;
log
3
=
0.477
,
log
2
=
0.30
]
Q.
Ammonium acetate which is 0.01 M, is hydrolysed to 0.001 M concentration. Calculate the change in pH in 0.001 M solution, if initially
p
H
=
p
K
a
.
l
o
g
9
=
0.354
,
l
o
g
3
=
0.477
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