Aluminum oxide (Al₂O₃) and sodium hydroxide (NaOH) react to form sodium aluminate (NaAlO₂) and water (H₂O).

The balanced chemical equation for this reaction is:

Al₂O₃ + 2 NaOH → 2 NaAlO₂ + H₂O

This reaction is typically carried out at high temperatures and pressures.