What happens when washing soda is exposed to air

Answer 1

When washing soda (sodium carbonate) is exposed to air, it can undergo a physical change known as efflorescence. The washing soda crystals absorb moisture from the air, causing them to lose water molecules and become hydrated. This process results in the formation of a white powdery substance on the surface of the washing soda, which is sodium carbonate decahydrate (Na2CO3 · 10H2O). This is commonly seen as a powdery deposit or crust on the outside of a washing soda container.