What is the chemical reaction for NH3 and BaSO4?

When ammonia (NH₃) interacts with barium sulfate (BaSO₄), there is no significant chemical reaction because BaSO₄ is a sparingly soluble salt. However, if ammonia is in the form of ammonium hydroxide (NH₄OH), it can react with barium sulfate to produce ammonium sulfate (BaSO₄) and barium hydroxide (Ba(OH)₂), though this is more of a theoretical consideration as BaSO₄ remains largely undissolved in solution. Overall, the interaction is minimal in practical terms due to the low solubility of barium sulfate.