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In the reaction, H2O2 + SO3 -> H2SO5, how do you identify which one is the lewis acid and which one is the lewis base? I know what the definitions are, but how do you determine which of the reactions is the electron "donor" and which one is the "acceptor" since they merge into one molecule?
I think the best way to determine is to draw out all the lewis structures. And you can see the lewis structure of the final product is still drawn around the sulfur atom, meaning it accepts the electrons. Therefore, it's the Lewis acid.
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