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So what I got form today is that catalyst are already present in the reaction, and in a later step they are removed. The intermediates are produced later and not originally present in the reaction. Only to be used up by the reaction in another step.
a catalyst is not consumed in a reaction whereas an intermediate is used up in a reaction and you can cancel it out in the elementary steps. This is why it is okay to have a catalyst in your rate law as well.
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