Here is an acid-base reaction between ionic species dissolved in water:
(aq)= dissolved in water
Find out which species are reacting and write down the annotated acid-base equation!
$H_3O^+$ $+$ $HCO_3^-$ $\longrightarrow$ $H_2O$ $+$ $H_2O$ $+$ $CO_2$
hydronium + hydrogencarbonate → water + carbon dioxide and water
