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H₂O is the Lewisin thefollowing reaction.SO3(aq) + 2H₂O(1) = H₂SO3(aq) + 2OH- (aq)ABacidbase

H₂O is the Lewisin thefollowing reaction.SO3(aq) + 2H₂O(1) = H₂SO3(aq) + 2OH- (aq-example-1
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The definition of a Lewis acid and base is: Acid is any substance that can accept a pair of nonbonding electrons, while that a Base is a species that contains a nonbonding pair of electrons, and in the reaction in the question:

SO3 + H2O -> H2SO3 + 2 OH-

We have SO3 as the conjugate base of the acid H2SO3 and H2O is acting as an acid in this occasion, therefore the answer is Acid

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