Hi Chemists :). I am looking after Kinetics. I have optimised the system and wanted to determine kinetic parameters. I went through the theory and I understood. My system (heterogeneous catalysis) behaves like pseudo-first order ( as i got linear line for first order plot). But, i couldnot prove the rate constant independence of substrate concentration. I varied the substrate concentration keeping all the other parameters constant. According to kinetic theory, the slope of the lines should be same meaning that the kinetic plots w.r.t. different substrate concentration should be parellel. But I didn’t get that. Another thing is that, according to pseudo kinetics, the concentration of reactant B (H2O2 in my case) is almost constant (minimal change) but in my case is change gradually. Please update me.
Thank you.
✅ Answers
Answerer 1
I’m just an organic chemist, but as I recall, one needs to run the experiments under stoichiometric conditions, not pseudo-first-order conditions, in order to be able to observe the “true” (not pseudo-first-order) behavior.
The example given here:
http://chemwiki.ucdavis.edu/Physical_Che…
shows data that are obtained under non-pseudo-first-order conditions.