In class we watched a demonstration where the color of the solution oscillated b

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. Water is a product of this reaction
2. I- is a reactant in this reaction
3. H+ is a catalyst in this reaction
4. OH- is an intermediate in this reaction
5. This reaction is third order with respect to I-

1
5
3
0
2

Explanation / Answer

answer : 3 statements are correct

correct statements :

1. Water is a product of this reaction
2. I- is a reactant in this reaction

4. OH- is an intermediate in this reaction

incorrect statement :

3. H+ is a catalyst in this reaction5.

5.This reaction is third order with respect to I-

reaction order determined experrimentally , not by by stochiometric coefficients.

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