`SO_2` has acidic character. Explain.

Explanation

Sulphur dioxide, `SO_2` dissolves in water to form sulphurous acid `H_2 SO_3`.
`SO_(2) (g) + H_2 O (l) to H_2 SO_3 (aq)`
`H_2 SO_3` is a weak acid and ioniser in water to give `H_3 O^+` ions. These `H_3 O^+` ions are responsible for the acidic character of `SO_2` .
`H_2 SO_3 (aq) + H_2 O (l) to H_3 O^+ (aq) + HSO_3^(-) (aq)`