Final answer:
Reacting CO2 with water results in a basic solution because carbon dioxide reacts with water to form carbonic acid, which then ionizes to produce bicarbonate and hydrogen ions.
Step-by-step explanation:
Reacting CO2 with water results in a basic solution. This is because carbon dioxide reacts with water to form carbonic acid (H2CO3), which then ionizes to produce bicarbonate (HCO3-) and hydrogen (H+) ions. The bicarbonate ion acts as a weak base, resulting in a basic solution.