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Posted: Sat Mar 14, 2020 11:58 am
How can you determine the catalyst by looking at the reaction? For example in 7E.5, how do you know the catalyst in this reaction?
Posted: Sat Mar 14, 2020 12:08 pm
A catalyst will be present in the beginning of the reaction (in reactants) but will be consumed in the reaction and thus will not appear in the final product. In 7E.5, the hydroxide ion (OH-) serves as the catalyst since it's present in the reactant of step 1 and in the product of step 2 (cancelling each other out).
Posted: Sat Mar 14, 2020 12:15 pm
Yes, essentially, a catalyst will be consumed as a reactant but reproduced again as a product in the final step. Thus, it cancels out and does not show up in the overall reaction. Just look at the products and reactants between steps; if a substance is consumed but reappears, then it is a catalyst! Hope this helps!
Posted: Sat Mar 14, 2020 1:15 pm
It must be introduced as a reactant, as opposed to an intermediate, which is produced as a product first, then maybe used as a reactant. Catalysts also must reappear as products in equal amount as was inputted.
Posted: Sat Mar 14, 2020 1:41 pm
It is introduced as a reactant, and then produced as a product in the following equations showing that it remains unconsumed in the reaction.
Posted: Sat Mar 14, 2020 4:14 pm
A catalyst is used up and formed and an intermediate is formed and used up.