- In the reaction \(\mathrm{HNO}_{3}(aq) + \mathrm{Br}^{-}(aq) \rightleftarrows \mathrm{HBr}(aq) + \mathrm{NO}_{3}^{-}(aq)\), \(\mathrm{HNO}_{3}\) donates a proton, so it is the acid.
- \(\mathrm{Br}^{-}\) accepts a proton, so it is the base.
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