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!
$H_3O^+$ $+$ $HSO_3^-$ $\longrightarrow$ $H_2O$ $+$ $H_2O$ $+$ $SO_2$
hydronium + hydrogensulfite → water + sulfur dioxide and water
