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EAMCET Engineering 2001 Solved Paper
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© examsnet.com
Question : 94
Total: 200
The
p
K
a
of a weak acid is 4.8 . What should be the ratio of
[
acid
]
[
salt
]
, if a buffer of
pH
=
5.8
is required?
0.1
10
1
2
Validate
Solution:
pH
=
p
K
a
+
log
[
salt
]
[
acid
]
5.8
=
4.8
+
log
[
salt
]
[
acid
]
∴
log
[
salt
]
[
acid
]
=
5.8
−
4.8
=
1.0
[
salt
]
[
acid
]
=
antilog
of
[
1.0
]
=
10
1
∴
[
acid
]
[
salt
]
=
1
10
=
0.1
© examsnet.com
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