* Hydrated Magnesium Sulfate: Magnesium sulfate typically exists as a hydrate, meaning it has water molecules attached to its crystal structure. This is often represented as MgSO₄·xH₂O, where "x" represents the number of water molecules per formula unit.
* Dehydration: When heated, the water molecules in the hydrated magnesium sulfate are driven off as water vapor. This process is called dehydration.
* Anhydrous Magnesium Sulfate: After the water is removed, the remaining solid is anhydrous magnesium sulfate (MgSO₄). Since anhydrous magnesium sulfate has a lower molecular weight than the hydrated form, it might appear that the mass has decreased. However, the water vapor released is simply lost to the atmosphere, so the total mass remains constant.
In summary:
* The apparent decrease in mass is due to the loss of water molecules during dehydration.
* The actual mass remains constant; the water vapor simply escapes into the environment.
Important note: If the heating is continued at very high temperatures, the anhydrous magnesium sulfate might decompose further, potentially leading to a decrease in mass. However, this is a separate process that occurs at much higher temperatures than typical dehydration.
