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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).
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!
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