Answer:
H₂O and H₂CO₃
Explanation:
Per the Brønsted-Lowry theory, an acid is a substance that can donate a proton to another substance.
[tex]\text{HCO}_{3}^{-} + \underbrace{\hbox{H$_{2}$O }}_{\hbox{acid}} \, \rightleftharpoons \, \underbrace{\hbox{H$_{2}$CO$_{3}$}}_{\hbox{acid}} + \,\text{OH}^{-}[/tex]
In the forward reaction, the water acts as a Brønsted-Lowry acid. It donates a proton to the bicarbonate ion and converts it to carbonic acid.
In the reverse reaction, the carbonic acid acts as a Brønsted-Lowry acid. It donates a proton to the hydroxide ion and converts it to water.
