Sodium oxide (Na₂O) is a basic oxide. When it dissolves in water, it reacts to form sodium hydroxide (NaOH), a strong base.

Here's the reaction:

Na₂O + H₂O → 2NaOH

Since NaOH is a strong base, the pH of a solution containing sodium oxide will be significantly higher than 7, indicating a strongly alkaline solution.

It's important to note that the exact pH will depend on the concentration of the sodium oxide solution.