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KCET 2015 Chemistry Solved Paper
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© examsnet.com
Question : 37
Total: 60
100
c
m
3
of 1 M
C
H
3
C
O
O
H
was mixed with 100
c
m
3
of
2
M
C
H
3
O
H
to form an ester. The change in the initial rate if each solution is diluted with equal volume of water would be
2 times
4 times
0.5 times
0.25 times
Validate
Solution:
For the esterification reaction
C
H
3
C
O
O
H
1
M
+
C
H
3
O
H
2
M
→
C
H
3
C
O
O
C
H
3
1
M
+
H
2
O
r
1
=
k
[
C
H
3
C
O
O
H
]
[
C
H
3
O
H
]
=
k
[
1
]
[
2
]
r
1
=
2
k
→ (1)
when solution is diluted with equal volume of water, concentration is reduced to half
r
2
=
k
[
1
2
]
[
2
2
]
r
2
=
k
2
→ (2)
Divide Eq. (1) by Eq. (2), we get
r
1
r
2
=
2
k
k
2
=
4
r
2
=
r
1
4
=
0.25
r
1
Therefore, the rate of the reaction will reduce to 0.25 times of the initial rate.
© examsnet.com
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