help needed about reaction mechanism.

[yaogeorge]

this question, could someone tell me the answer and how you did it'?

H2O2+2I^- + 2H^+ -----> 2H2O + I2

This rxn is considered to go by the following step:
step1: H2O2 + I^- ------>IO^- + H2O (SLOW)
step2: IO^- + H^+ -------> HOI SLOW
step3: HOI + H^+ I^- ------> I2+H2O SLOW
6B
the general form of the rate eqn is rate = k[H2O2]^a[I^-]^b[H^+]^c

a)suggest values for the orders of a,b,c in the rate eqn.

thx in advance.

 

[destined007]

I think there is something wrong with the question because you have mentioned every step as slow step. Check if there is any fast steps.
Anyway, if the question is correct then a=1 b=2 c=2

 

[kshumaila52]

this question, could someone tell me the answer and how you did it'?

H2O2+2I^- + 2H^+ -----> 2H2O + I2

This rxn is considered to go by the following step:
step1: H2O2 + I^- ------>IO^- + H2O (SLOW)
step2: IO^- + H^+ -------> HOI SLOW
step3: HOI + H^+ I^- ------> I2+H2O SLOW
6B
the general form of the rate eqn is rate = k[H2O2]^a[I^-]^b[H^+]^c

a)suggest values for the orders of a,b,c in the rate eqn.

thx in advance.

Read Question carefully ..Its Nov 08/41 Q2
In question it is mention that 1st step is the slowest step, then 2nd and so on...
Keep in mind, slow step is rate determining step and ans it( Step before Slowest step ll also slow step as according to question)
Our teacher(Sir faiz) give full detail, i ll try to upload his notes..

Read question properly...
Its Nov08/41 Q2.
Examiner is saying id 1st step is the slowest 2nd and so on...
so keeping in mind slow step is rate determine step so u can ans...Our teacher(Sir Faiz) Explain in detail during lecture

 

[kshumaila52]

I ll try to upload his Notes..

 

[yaogeorge]

but my teacher gv us the question like this= =that's why ...~ but after go through the question that in past year.. i'm quite understand what u really mean..
thanks for sharing your notes! i'm waiting~

 

[destined007]

look at these
http://www.youtube.com/watch?v=WZL91tOD1bc part 1
http://www.youtube.com/watch?v=ReoLFdRX ... ure=relmfu part 2
http://www.youtube.com/watch?v=NS_ppv43 ... ure=relmfu part 3
http://www.youtube.com/watch?v=oxodz4FS ... ure=relmfu part 4
http://www.youtube.com/watch?v=nnmY6zx9 ... ure=relmfu part 5
http://www.youtube.com/watch?v=xf-gGPM- ... ure=relmfu part 6
http://www.youtube.com/watch?v=wz3ja95z ... ure=relmfu part 7
http://www.youtube.com/watch?v=mpJZQwjj ... ure=relmfu part 8
http://www.youtube.com/watch?v=58F7a2td ... ure=relmfu part 9