In class we watched a demonstration where the color of the solution oscillated b
ID: 636595 • Letter: I
Question
In class we watched a demonstration where the color of the solution oscillated between orange and blue. This is a very complicated reaction with multiple pathways the reaction can take. One pathway can be described as follows: H2O2 + 3 I- + 2 H+ ? I3- + 2 H2O
Step 1. H2O2 + H+ ? H3O2+
Step 2. H3O2+ + I- ? H2O + HOI
Step 3. HOI + I- ? OH- + I2
Step 4. OH- + H+ ? H2O
Step 5. I2 + I- ? I3-
How many of the following statements are correct based on the information given?
1. I3- is a product of this reaction
2. I2 is a reactant in this reaction
3. H+ is a catalyst in this reaction
4. I2 is an intermediate in this reaction
5. This reaction is second order with respect to H+
Answer Options: 3, 5, 1, 0, 2
Explanation / Answer
for the reaction : H2O2 + 3 I- + 2 H+ ? I3- + 2 H2O
we have
Step 1. H2O2 + H+ ? H3O2+
Step 2. H3O2+ + I- ? H2O + HOI
Step 3. HOI + I- ? OH- + I2
Step 4. OH- + H+ ? H2O
Step 5. I2 + I- ? I3-
where
I2 is intermediate as it is produced as well as being consumed in the reaction process.
H+ is an reactant as it is being consumed in the reaction.
This reaction is second order with respect to H+
I3- is a product of this reaction as it is being produced in the reaction .
therefore
the correct answers are :
1. I3- is a product of this reaction
4. I2 is an intermediate in this reaction
5. This reaction is second order with respect to H+
and therefore
Answer Options: 3 (three) statements are correct based on the information given.
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