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Chemistry

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    $\begingroup$ If the rate constant depends on the concentration of something, it is not a rate constant. $\endgroup$
    – Maurice
    Commented Dec 2, 2020 at 22:04
  • $\begingroup$ Then how would you define rate constant where the rate determining step can change if the concentration of one component is changed to a large extent? $\endgroup$
    – S R Maiti
    Commented Dec 2, 2020 at 22:09
  • $\begingroup$ TST is a crude approximation. It works only for elementary steps, only for the defined potential hyper surface. If you change the concentrations, you change the surface, the approximation breaks. P.S.: Please don't use mhchem for non-chemistry items. $\endgroup$
    – Martin - マーチン ♦
    Commented May 13, 2021 at 17:40
  • $\begingroup$ @Martin-マーチン Thank you. So what happens to the rate constant then? It changes, right? $\endgroup$
    – S R Maiti
    Commented May 13, 2021 at 17:51
  • $\begingroup$ If with "change" you mean it was once that and became that, then: no. If with "change" you mean it is completely different and has absolutely no relationship with anything else, then: yes. That includes the cases, where that rate appears to be equal. I think I need to stress that again: TST only ever works for a single, well defined potential hyper surface. $\endgroup$
    – Martin - マーチン ♦
    Commented May 13, 2021 at 17:57