![Rate Law: Zeroeth-Order Reaction
A→B
Rate Law:
0
Rate = k x [A]
B appears at same rate that A
disappears, but the rate is independent
of the concentration of A](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-1-320.jpg)
![0
[A]
[B]
1.50
0.00
Reaction
Begins:
Initial
Concentration
Of A is 1.50 M
K
0.05
M/s
Concentration v Time
A rearranging to B
1.6
1.4
Concentration (M)
Time (s)
1.2
[A]
[B]
1
0.8
0.6
0.4
0.2
0
0
5
10
15
20
time
25
30
35
40](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-2-320.jpg)
![Time
[A]
[B]
0
1.50
0.00
1
1.45
0.05
Zeroeth Order Reaction
Rate = k[A]º
1.6
1.4
1.2
[A]
[B]
1
[A] (M)
In first second,
0.05 molar
Reduction in [A]
And 0.05 molar
Increase in [B]
0.8
0.6
0.4
0.2
0
0
5
10
15
20
time (s)
25
30
35
40](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-3-320.jpg)
![Time
[A]
[B]
0
1.50
0.00
1
1.45
0.05
2
1.40
0.10
Zeroeth Order Reaction
1.6
1.4
1.2
1
[A] (M)
In second
second, rate is
the same
because
[A] has no effect
on the rate
[A]
[B]
0.8
0.6
0.4
0.2
0
0
5
10
15
20
time (s)
25
30
35
40](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-4-320.jpg)
![Time
[A]
[B]
0
1.50
0.00
5
1.25
0.25
10
1.00
0.50
15
0.75
0.75
20
0.50
1.00
25
0.25
1.25
0.00
1.6
1.4
1.2
1.50
A reaction rate
study yielding a
linear relationship
between time and
concentration
indicates a zeroeth
order reaction in
the reactant. This
is uncommon.
1
[A] (M)
30
Zeroeth Order Reaction
[A]
[B]
0.8
0.6
0.4
0.2
0
0
5
10
15
20
25
30
35
40
time (s)
After 30 seconds it is easy to
see the reaction is over.](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-5-320.jpg)
![Lower Rate Constant
Zeroeth Order Reaction
1.6
1.4
1.2
[A] (M)
1
[A]
[B]
0.8
0.6
0.4
0.2
0
0
5
10
15
20
25
30
35
40
time (s)
This is the effect of changing
the rate constant to 0.01 M/s.
The reaction is much slower
but the concentration does
not affect the rate.](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-6-320.jpg)
![Higher Rate Constant
Zeroeth Order Reaction
1.6
1.4
1.2
[A] (M)
1
[A]
[B]
0.8
0.6
0.4
0.2
0
0
5
10
15
20
25
30
35
40
time (s)
This is the effect of changing
the rate constant to 0.10 M/s.
The reaction is much faster.
Still no concentration effect.](https://image.slidesharecdn.com/zeroethorderreactiongraph-140121181324-phpapp02/85/Zeroeth-orderreactiongraph-7-320.jpg)
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Zeroeth orderreactiongraph
- 1. Rate Law: Zeroeth-Order Reaction A→B Rate Law: 0 Rate = k x [A] B appears at same rate that A disappears, but the rate is independent of the concentration of A
- 2. 0 [A] [B] 1.50 0.00 Reaction Begins: Initial Concentration Of A is 1.50 M K 0.05 M/s Concentration v Time A rearranging to B 1.6 1.4 Concentration (M) Time (s) 1.2 [A] [B] 1 0.8 0.6 0.4 0.2 0 0 5 10 15 20 time 25 30 35 40
- 3. Time [A] [B] 0 1.50 0.00 1 1.45 0.05 Zeroeth Order Reaction Rate = k[A]º 1.6 1.4 1.2 [A] [B] 1 [A] (M) In first second, 0.05 molar Reduction in [A] And 0.05 molar Increase in [B] 0.8 0.6 0.4 0.2 0 0 5 10 15 20 time (s) 25 30 35 40
- 4. Time [A] [B] 0 1.50 0.00 1 1.45 0.05 2 1.40 0.10 Zeroeth Order Reaction 1.6 1.4 1.2 1 [A] (M) In second second, rate is the same because [A] has no effect on the rate [A] [B] 0.8 0.6 0.4 0.2 0 0 5 10 15 20 time (s) 25 30 35 40
- 5. Time [A] [B] 0 1.50 0.00 5 1.25 0.25 10 1.00 0.50 15 0.75 0.75 20 0.50 1.00 25 0.25 1.25 0.00 1.6 1.4 1.2 1.50 A reaction rate study yielding a linear relationship between time and concentration indicates a zeroeth order reaction in the reactant. This is uncommon. 1 [A] (M) 30 Zeroeth Order Reaction [A] [B] 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 time (s) After 30 seconds it is easy to see the reaction is over.
- 6. Lower Rate Constant Zeroeth Order Reaction 1.6 1.4 1.2 [A] (M) 1 [A] [B] 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 time (s) This is the effect of changing the rate constant to 0.01 M/s. The reaction is much slower but the concentration does not affect the rate.
- 7. Higher Rate Constant Zeroeth Order Reaction 1.6 1.4 1.2 [A] (M) 1 [A] [B] 0.8 0.6 0.4 0.2 0 0 5 10 15 20 25 30 35 40 time (s) This is the effect of changing the rate constant to 0.10 M/s. The reaction is much faster. Still no concentration effect.