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Standard XII
Chemistry
Question
The pH of a
10
−
10
M
N
a
O
H
solution is:
10
7.01
6.99
4
A
10
B
7.01
C
6.99
D
4
Open in App
Solution
Verified by Toppr
At
25
0
C
,
Concentration of
O
H
−
ions is
10
−
7
M
as present in water.
But the c
oncentration, in this case, is given as of
[
O
H
−
]
=
(
10
−
7
+
10
−
10
)
M
=
1.001
×
10
−
7
Now,
p
O
H
=
−
l
o
g
[
O
H
−
]
=
−
l
o
g
(
1.001
×
10
−
7
)
=
7
−
l
o
g
(
1.001
)
=
7
−
0.00043
≈
6.99
p
H
=
14
−
p
O
H
=
14
−
6.99
≈
7.01
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