* Reaction with Water: When carbon dioxide dissolves in water, it forms carbonic acid (H2CO3):

CO2 (g) + H2O (l) ⇌ H2CO3 (aq)

* Reaction with Bases: Carbon dioxide reacts with bases like sodium hydroxide (NaOH) to form salts (like sodium carbonate, Na2CO3) and water:

CO2 (g) + 2NaOH (aq) → Na2CO3 (aq) + H2O (l)

These reactions demonstrate that carbon dioxide exhibits the properties of an acidic oxide.