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: H_2O_2 + 3 I^- + 2 H^+ rightarrow I_3^-T + 2 H_2O Step 1. H_2O_2 + H^+ rightarrow H _3O_2^+ Step 2. H_3O_2^+ + I^- rightarrow H_2O + HOI Step 3. HOI + I^- rightarrow OH^- + I_2 Step 4. OH^- + H^+ rightarrow H_2O Step 5. I_2 + I^- rightarrow I_3^- How many of the following statements are correct based on the information given? This reaction is third order with respect to I^- Water is a product of this reaction I^- is a reactant in this reaction H_3O_2^+ is a catalyst in this reaction HOI is an intermediate in this reaction 1 2 3 5 0

Explanation / Answer

Statement 1 : it is incorrect. The order of the reaction depends on the no of species involved in rate determining step. If 3 I- would be involved in one step and tis would be the rae determinin step then the order of the reacton would be 3 with resect to I-. But here 3 I- i involved in three steps and hence order of the reaction wih respect to iodide is not 3

Statement 2: It is correct. Water is a product of the reaction which is formed from the reduction of hydrogen peroxide.

Statement 3: it is correct. I- is a reactant which is oxidised to give I3-

Statement 4: it is incorrect. The species is an intermediate of the reaction and hence in the overall reaction it is not present. It is formed during the course of the reaction and is converted to the product.

Statement 5: it is correct.

So, 3 statements are correct.

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