Here's what the formula means:
* Na₂SO₄: This represents the anhydrous sodium sulfate, meaning it's the salt without any water molecules attached.
* ·: This dot symbolizes that water molecules are attached to the sodium sulfate molecule.
* 10H₂O: This indicates that there are 10 water molecules (H₂O) associated with each unit of sodium sulfate.
Therefore, sodium sulfate decahydrate has ten water molecules of hydration per formula unit.
