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A proton is transferred from the acid to the base. The acid loses a proton and forms itsconjugate base, while the base accepts the proton and forms its conjugate acid.1. H2CO3 (acid) -> HCO3- (conjugate base)2. H2O (base) -> H3O+ (conjugate acid)3. HI (acid) -> I- (conjugate base)In the first row of the table, the acid is H2CO3 (carbonic acid) and its conjugate base is HCO3- (bicarbonate ion). The bicarbonate ion can act as a base because it can accept aproton(H+).In the second row, the base is H2O (water) and its conjugate acid is H3O+ (hydronium ion). Water can act as a base by accepting a proton to form the hydronium ion.In the last row, the acid is HI (hydroiodic acid) and its conjugate base is I- (iodide ion). The iodide ion can act as a base by accepting a proton.To know more aboutprotonvisit:-brainly.com/question/12535409#SPJ11...