## Chemistry: The Molecular Science (5th Edition)

$H_2SO_3(aq) + H_2O(l) \lt -- \gt HS{O_3}^-(aq) + H_3O^+(aq)$ $H{SO_3}^-(aq) + H_2O(l) \lt -- \gt S{O_3}^{2-}(aq) + H_3O^+(aq)$
1. Identify if the compound is a polyprotic acid or base: - $H_2SO_3$ is an acid. 2. Write the ionization equation for the original acid. - Write an equation where $H_2SO_3$ donates a proton to a water molecule. 3. Now, for polyprotic acids, the conjugate base is capable of donating one proton too, so write an equation where it does that. - $HS{O_3}^-$ can act as an acid too, so write an equation where it donates a proton to a water molecule. - Repeat "Step 3" for the next reaction, until the conjugate base is incapable of donating one proton.