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What is the role of the phosphoric acid in asprin synthesis? PROVIDE A MECHANISM which explains...

What is the role of the phosphoric acid in asprin synthesis? PROVIDE A MECHANISM which explains the role of this

chemical in this reaction.

---I know that phosphoric acid is needed because it is an acid and as an acid it acts as a catlyst in this experiment. What I do not know is how to provide a mechanism which explains the role of this checmical reaction

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