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JEE Main 2013 Question Paper
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© examsnet.com
Question : 9
Total: 90
How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
0.9 L
2.0 L
9.0 L
0.1 L
Validate
Solution:
At
p
H
=
1
Concentration of
[
H
+
]
=
1
0
−
1
M
=
0
.
1
M
At
p
H
=
2
Concentration of
[
H
+
]
=
1
0
−
2
M
=
0
.
1
M
Now
M
1
V
1
=
M
2
V
2
0
.
1
M
×
1
1
=
0
.
0
1
M
×
V
2
V
2
=
1
0
L
Thus the final volume of solution is
10
L
.
Hence
9
L
should be added to
1
L
of solution to make
p
H
=
2
from
p
H
=
1
© examsnet.com
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