Chemistry 1b Midterm 2 Worksheet With Answers Page 5
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2
3
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5
6
7
813 pts
2)
The reaction
-
-
+
(aq) 3Br
5Br
(aq) + BrO
(aq) + 6H
(l) + 3H
O(l)
3
2
2
Is expected to obey the mechanism
(aq) ⇌ HBrO
-
+
BrO
(aq) + H
(aq)
Fast Equilibrium
3
3
k
(forward)/k
(backward)
1
-1
(aq) ⇌ H
+
+
HBrO
(aq) + H
BrO
(aq)
Fast Equilibrium
3
2
3
k
(forward)/k
(backward)
2
-2
-
+
(aq) (Br-BrO
Br
(aq) + H
BrO
)(aq) + H
O(l) Slow
2
3
2
2
k
3
+
-
(aq) products Fast
(Br-BrO
)(aq) + 4H
(aq) + 4Br
2
k
4
Write the rate law for this reaction and show what the overall k is in terms
of elementary reaction ks.
rate
k
Br
H
BrO
3
2
3
+
H
BrO
is an intermediate therefore, needs to be eliminated from
2
3
the rate law. Use equilibrium to eliminate the intermediate.
k
HBrO
H
k
H
BrO
2
3
2
2
3
k
HBrO
H
2
3
H
BrO
2
3
k
2
k
k
Br
HBrO
H
2
3
3
rate
k
Br
H
BrO
3
2
3
k
2
HBrO
is an intermediate therefore, needs to be eliminated from
3
the rate law. Use equilibrium to eliminate the intermediate.
k
BrO
H
k
HBrO
1
3
1
3
k
BrO
H
1
3
HBrO
3
k
1
2
k
k
Br
HBrO
H
k
k
k
Br
BrO
H
2
3
3
2
3
1
3
rate
k
k
k
2
2
1
2
rate
k
Br
BrO
H
3
k
k
k
2
3
1
k
k
k
2
1
5
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