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# Mechanisms & Rate determining steps watch

1. Hello!
I try to find the mechanism for the following chemical reaction:
2KI(aq)+ H2O2(aq) + H2SO4(aq) à K2SO4(aq) + I2(aq)+ H2O(l)

The rate equation I got is as following:
Rate = k * [KI] * [H2O2] * [H2SO4]
I was thinking about the following:2KI+ H2SO4 à K2SO4 + 2HI2HI+ H2O2 à I2 + 2H2O But it does not fit my rate equation.
Maybe you can give me a hint? I think I am doing something wrong here.
2. (Original post by Sofya)
Hello!
I try to find the mechanism for the following chemical reaction:
2KI(aq)+ H2O2(aq) + H2SO4(aq) à K2SO4(aq) + I2(aq)+ H2O(l)

The rate equation I got is as following:
Rate = k * [KI] * [H2O2] * [H2SO4]
I was thinking about the following:2KI+ H2SO4 à K2SO4 + 2HI2HI+ H2O2 à I2 + 2H2O But it does not fit my rate equation.
Maybe you can give me a hint? I think I am doing something wrong here.
There is no relationship between the rate equation and the stoichiometric equation.

The rate equation provides evidence regarding only the rate determining step of a mechanism.
The sum of the mechanistic steps gives the stoichiometric equation.
3. (Original post by Sofya)
Hello!
I try to find the mechanism for the following chemical reaction:
2KI(aq)+ H2O2(aq) + H2SO4(aq) à K2SO4(aq) + I2(aq)+ H2O(l)

The rate equation I got is as following:
Rate = k * [KI] * [H2O2] * [H2SO4]
I was thinking about the following:2KI+ H2SO4 à K2SO4 + 2HI2HI+ H2O2 à I2 + 2H2O But it does not fit my rate equation.
Maybe you can give me a hint? I think I am doing something wrong here.
Reaction is zero order wrt sulphuric acid.

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